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People Are Using Recycled Laptop Batteries To Power Their Homes (vice.com)

New submitter gooddogsgotoheaven writes: DIY Powerwall builders from around the world are harvesting old laptop batteries and turning them into powerful batteries capable of supplying energy to their entire homes. "It's the future. It's clean, simple, efficient and powerful," Jehu Garcia, one of the most popular powerwall builders, told me. He and people like him are deciding for themselves what the future of alternative energy will look like, instead of waiting for technology companies to shape it for them. "The end result is being able to rely on something I not only built myself but understand the ins and outs of to power some or all of my electricity in my home. That is inspiring," Joe Williams, another powerwall builder, told me.

157 comments

  1. IDTS by Frosty+Piss · · Score: 4, Insightful

    Jesus. Nope, nope, nope. Dying in a fire isn't my preferred way to go.

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    If you want news from today, you have to come back tomorrow.
    1. Re:IDTS by Captain+Splendid · · Score: 4, Interesting

      Meh, you build yourself a little block shed separated from your house. Problem solved.

      --
      Linux, you magnificent bastard, I read the fucking manual!
    2. Re:IDTS by Anonymous Coward · · Score: 0

      In related news, DIY Powerwall builders from around the world are experiencing DIY Spontaneous In-The-Home Bonfires that are excellent for roasting marshmallows if you can just get past that electrical burning smell...

    3. Re: IDTS by Anonymous Coward · · Score: 1

      I could say the same about car tinkerers. Gasoline is flammable as fuck.
      And I find that the average intelligence among those who like to tinker with electricity is higher than that among those who like to tinker with cars.

    4. Re: IDTS by Anonymous Coward · · Score: 0

      Go die in a fire, you pyrophobic faggot.

    5. Re: IDTS by arkane1234 · · Score: 2

      Fires bad, mmmm'kay?
      Fire burns and stuff.

      --
      -- This space for lease, low setup fee, inquire within!
    6. Re: IDTS by rickb928 · · Score: 1

      And the coming wave of cars to tinker with that have THREE batteries. In different places.For different purposes.

      Great fun. Next, sourcing new dash screens in 14 years

      --
      deleting the extra space after periods so i can stay relevant, yeah.
    7. Re: IDTS by Anonymous Coward · · Score: 0

      I am a pyrophoric faggot, you insensitive clod!

    8. Re:IDTS by sycodon · · Score: 4, Insightful

      I have had more than double the number of batteries for my laptops than I have had laptops.

      Battery lifetimes seem to be about a third of the computer.

      Where are they getting perfectly good batteries that are "recycled"?

      --
      When Fascism comes to America, it will call itself Anti-Fascism, and tell you to give up your guns.
    9. Re:IDTS by Athanasius · · Score: 4, Interesting

      That was also my first thought, before I read TFA. Searching on 'safe' in it I find these quotes, and it's not all the hits:

      Gathering enough batteries is only the first step to building a DIY powerwall. Every cell then has to be tested—not all are safe enough to be used, several hobbyists told me. Lithium-ion batteries have a limited lifespan: Some laptop batteries harvested end up having too little capacity to be used.

      Most hobbyists I spoke to said they don't keep their powerwalls inside their homes for safety reasons or to comply with local regulations.

      One of the most frequent topics that came up in my conversations with powerwall makers was safety. Fusing together hundreds of recycled lithium-ion batteries is dangerous, and could cause a fire if done incorrectly.

      On the DIYpowerwalls forum, there are dozens of threads dedicated to preventing these massive, homemade electronic devices from catching ablaze. YouTube too is littered with videos warning powerwall builders that their projects are unsafe.

      DIY powerwall makers often aren't engineers or electricians. Most, including the most popular—like Jehu Garcia—lack formal training altogether. But they remain mostly unfazed by safety concerns, and said that more recently, makers have pushed each other to engineer more safeguards into their rigs.

      So, there is definitely some caution here, and awareness that such pre-used batteries may not be useful enough due to low charge levels.

    10. Re:IDTS by gweihir · · Score: 1

      If these people were doing that, fine. They are not. They put these battery packs right in their homes.
      They are amateurs with no idea of risk management or statistics and often only passing EE skills.

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    11. Re: IDTS by 93+Escort+Wagon · · Score: 1

      That's why you don't work on your car in your living room.

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      #DeleteChrome
    12. Re:IDTS by Anonymous Coward · · Score: 0

      Yeah, no. Pretty much any other kind of battery than a lithium-based one and you'd be fine but you still need to ensure proper fireproofing.

      And *recycled* lithium batteries? Continuing to apply charge to old batteries is one way you start stepping outside the happy green box and head towards thermal runaway.

    13. Re:IDTS by Gr8Apes · · Score: 1

      Only double? You must not be running Dell's (new battery every year, unless you're saying you only keep your laptops 2 years)

      --
      The cesspool just got a check and balance.
    14. Re: IDTS by PolygamousRanchKid+ · · Score: 3, Funny

      That's why you don't work on your car in your living room.

      Well, for some of us folks . . . that rusty Chevy up on cinder blocks on the front lawn IS the living room . . .

      --
      Schroedinger's Brexit: The UK is both in and out of the EU at the same time!
    15. Re:IDTS by PolygamousRanchKid+ · · Score: 2

      Meh, you build yourself a little block shed separated from your house.

      Yeah, that's what the Nuclear Boy Scout did.

      Maybe we should encourage more folks to skip those dangerous batteries, and go straight for their own private nukes . . . ?

      --
      Schroedinger's Brexit: The UK is both in and out of the EU at the same time!
    16. Re: IDTS by Anonymous Coward · · Score: 0

      This roughly the same as building your own fuel tank and fuel pump. Could I build one for a mower? Yes. Gravity feed, maybe a quart in size and a simple vent. Would I build a setup with a high pressure pump, return line and about 20 gallons of fuel? No. It's the scale issue that should concern you.

    17. Re: IDTS by Anonymous Coward · · Score: 2, Interesting

      They're not perfectly good. Most often, one group of cells is dead, but the others are fine. Sometimes all are fine, but so out of balance that the electronics cannot rectify it. Sometimes they are worn and don't have enough capacity for a portable application. And sometimes all cells are fine but the electronics is faulty.

    18. Re: IDTS by Anonymous Coward · · Score: 0

      But in your attached garage...

    19. Re:IDTS by Anonymous Coward · · Score: 0

      Problem solved.

      The engineer then took a long drag from his cigarette and declared "the Apollo 13 mission will be the smoothest yet."

    20. Re:IDTS by chispito · · Score: 2

      If these people were doing that, fine. They are not. They put these battery packs right in their homes. They are amateurs with no idea of risk management or statistics and often only passing EE skills.

      And yet from TFA:

      Most hobbyists I spoke to said they don't keep their powerwalls inside their homes for safety reasons or to comply with local regulations.

      --
      The Daddy casts sleep on the Baby. The Baby resists!
    21. Re:IDTS by Anonymous Coward · · Score: 0

      certainly not for the battery life of 1 hour or less of spent laptop batteries. If I'm going to die in a fire, it'll have to be at least an 8 hour battery.

    22. Re:IDTS by gweihir · · Score: 1

      Most hobbyists I spoke to said they don't keep their powerwalls inside their homes for safety reasons or to comply with local regulations.

      And then you look at the pictures in the article...

      --
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    23. Re:IDTS by VeryFluffyBunny · · Score: 1

      Yay, home fireworks! :) https://www.youtube.com/result...

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    24. Re:IDTS by Anonymous Coward · · Score: 0

      I've set up an application (tlp on Linux) on my Lenovo Thinkpad T61 that stops charging the battery when it is at 80% of remaining capacity. This battery pack has not lost noticeable capacity for the past year. And it went down to something like 60% within a year before that. Just wished I had discovered this sooner.

      The cells are just not built for being kept at full charge for long times. So what if I am missing out on 20% in the first months of use?

    25. Re:IDTS by Anonymous Coward · · Score: 0

      Don't worry. No one really dies of a fire. They die of asphyxiation before their dead bodies burn up.

    26. Re:IDTS by AmiMoJo · · Score: 4, Informative

      Laptop batteries are made up for several individual cells. Often only one or two cells die, and the rest are fine. Take the pack apart, test each cell and discard the duff ones.

      This happens because cheap cells have variable quality, and because heat kills batteries but tends to be very uneven in a laptop, mostly on one side where the CPU is.

      Between old laptop batteries and old power tool batteries, and even written off cars, you can get a nearly infinite supply of very cheap/free LiPo cells that just need disassembling and testing.

      --
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      SJW, n: "Someone I don't like, and by the way I'm a fuckwit" - AC
    27. Re: IDTS by Anonymous Coward · · Score: 0

      This. And most people seem to just toss laptops when the battery dies (if not before) so I suspect there is a ready supply out there. Mind you, I'd still choose to keep the battery unit well separated from my house just in case: you're dealing with a *significant* number of NOS units here, so expect lower reliability, and failure is much more likely to be catastrophic than, say, a dodgy capacitor going pop.

      Actually out of curiosity: I know that it was common practice in power tool battery packs to just string the cells in series, which put a severe limit on lifetime as slight differences between battery capacity would result in uneven charging and (eventually) render the unit useless. Do laptops use more advanced methods, or is this floor still present there as well?

    28. Re: IDTS by Anonymous Coward · · Score: 0

      Laptop batteries are usually series-parallel. With Li-ion you _must_ supervise and balance the voltage of each group in the series string, so the packs have electronics that do this. The temperature is often also monitored.

    29. Re:IDTS by Anonymous Coward · · Score: 0

      Most hobbyists I spoke to said they don't keep their powerwalls inside their homes for safety reasons or to comply with local regulations.

      And then you look at the pictures in the article...

      None of those pictures looks like they're inside a house. I see a battery rack next to a workbench, boxes of loose batteries on a concrete floor, loose batteries in the trunk of a car, a guy holding up a battery rack, and in the section with the header "Don't burn the house down", three pictures of batteries beside or on concrete or plywood walls.

    30. Re:IDTS by Anonymous Coward · · Score: 0

      I see you are once again upholding the great Slashdot tradition of NOT READING THE FUCKING ARTICLE!

    31. Re: IDTS by zilym · · Score: 1

      Indeed. From my own personal disassembly, inspection and testing of both laptop battery packs and power tool battery packs, I'd say the laptop battery packs are engineered to fail. The Ryobi Li-Ion power tool battery packs I've had show far more advanced circuitry inside of them to maintain perfect charge balance between all 5 cells used in series. I've used my Ryobi packs heavily for years and have never had any completely shutdown -- only degrade in charge run-time slowly over time.

      Laptop batteries on the other hand, only have enough circuitry in them to MONITOR the charge balance between the 5 cells in series, with little or nothing to MAINTAIN charge balance between cells. When the individual cells inside become unbalanced too far, the battery pack circuitry shuts down the entire laptop battery pack from use, even if all of the cells inside are still perfectly fine. Yes, that's right, even if the cells are perfectly fine.

      For example, one Lenovo laptop I got came with a dinky 5S1P laptop battery that I used very sparingly -- always used my laptop on AC power with the battery only for avoiding reboot when I needed to move the laptop from room to room. I even used the power settings to initiate charging from below 80% rather than constantly maintaining 100% charge state. A year or two later with less than 20 total accumulated charge/discharge cycles -- the laptop would not take a charge at all any more. After taking the battery pack apart, found one cell that was below the 3.0V threshold that apparently trips the pack's "engineered to fail" trigger. After carefully cutting the cells out and charging them individually, ALL cells held a charge perfectly fine and that one that was below 3.0V initially turns out to be the strongest cell of the pack (largest mAh charge capacity).

      Now obviously, most failed laptop battery packs are going to have much more heavily used batteries than my example, but MANY packs are still going to have some usable batteries inside given how the crappy laptop battery circuitry works. Capacity will be lower and internal series resistance will be higher for heavily used batteries, but if you collected enough of them to put less work demand on each cell than they were initially used for, you CAN get many more years of use out of them.

      As with all Li-Ion batteries (new and old), beware of the potential for catastrophic failure (fire, fire, FIRE). Dentrites can form internally and cause a short, resulting in thermal run away. Misuse can also lead to problems. BEWARE, FIREBREATHING DRAGONS BE HERE.

    32. Re:IDTS by Anonymous Coward · · Score: 0

      The more you learn about battery tech the better.
      Try checking out Jack Rickard's salvaged Tesla battery pack and PV solar installation. He knows a Thing or two about how to keep those batteries from catching fire. It's all about the battery management system.

      http://media3.ev-tv.me/news081817-iPhone.mp4

    33. Re:IDTS by fustakrakich · · Score: 1

      I don't know. Disassembling a Li-Ion battery pack is a little like disarming a bomb. Get some thick plexiglass to protect yourself :-)

      For stationary use, you can't go wrong with NiFe batteries. You just need lots of space, and maybe your own forklift...

      --
      “He’s not deformed, he’s just drunk!”
  2. Not that I know about electricity by keith_nt4 · · Score: 4, Insightful

    But this seems to be a really, really bad idea. Just on the face of it.

    --
    "UNIX is very simple, it just needs a genius to understand its simplicity." -Dennis Ritchie
    1. Re: Not that I know about electricity by Anonymous Coward · · Score: 1

      If you did know about electricity, you would know (or know how to learn) which parts of the idea are bad and how to avoid or minimize the dangers.

    2. Re:Not that I know about electricity by Mr+D+from+63 · · Score: 2, Insightful

      Nothing wrong technically if you know what you are doing, but I question the value return on all the effort and cost including the lifetime and maintenance requirements considering you are starting with used batteries many of which are already in the late aging phase. It seems to lean more toward enthusiast and hobby value than it does practical value. And that's OK.

    3. Re: Not that I know about electricity by keith_nt4 · · Score: 3, Insightful

      Good thing I have slashdot commenters to know this stuff for me. So ya. What guy this said...

      by burtosis ( 1124179 )
      The problem with using laptop batteries is not the batteries, the tesla uses them. The problem is the smart battery circuitry needed to monitor currents and voltages, balance cells, thermally monitor strings (or ideally individual cells), gas gauge, and safely disconnect problem cells from the system. The major advancement in the tesla is the amazing cooling/heating system and the ability to rewire itself to stop using problem cells. Simply wiring up a bank of unmonitored cells is a disaster waiting to happen. The vast majority of home hobbiests lack the knowledge and wherewithal to implement proper battery safety. The packs in the stock photos, if lithium cells, are a disaster in the making. Disclaimer: have designed smart battery circuits for lithium batteries used in actual products.

      --
      "UNIX is very simple, it just needs a genius to understand its simplicity." -Dennis Ritchie
    4. Re:Not that I know about electricity by Anonymous Coward · · Score: 0

      As a degreed electrical engineer with 30 years professional experience, I wholeheartedly concur. This is just stupid...like everything posted here lately. I don't know why I hold out hope

    5. Re:Not that I know about electricity by Anonymous Coward · · Score: 0

      An average house uses ~30kwh/day. A laptop battery is maybe 0.3kwh, a factor of 100

    6. Re:Not that I know about electricity by Anonymous Coward · · Score: 0

      Well on the face of it they're still using the same amount of energy. Unless they are getting a lower rate at night to charge the batteries, I don't see how this decreases their cost of electricity, or uses any less. It is a fire hazard though. I don't see there is any payback or rate of return here.

    7. Re:Not that I know about electricity by thegarbz · · Score: 1

      But this seems to be a really, really bad idea. Just on the face of it.

      My friend cut himself sharpening his knife the other day. On the face of it, pretty much everything seems like a bad idea if you have no idea what you're doing.

    8. Re:Not that I know about electricity by AmiMoJo · · Score: 1

      You would be surprised how many good cells get thrown away. Often one cell in a pack dies and the whole pack is discarded, despite the rest of the cells having plenty of life left in them.

      Written off cars are another source of well maintained, barely used cells - a Nissan Leaf 24kWh pack will easily do 200k miles with 20% capacity loss even with constant rapid charging and 100% top-offs, so one with 40k miles that gets written off is going to have a lot of cells with a lot of life left in them.

      --
      const int one = 65536; (Silvermoon, Texture.cs)
      SJW, n: "Someone I don't like, and by the way I'm a fuckwit" - AC
    9. Re:Not that I know about electricity by Anonymous Coward · · Score: 0

      Solar/wind

    10. Re:Not that I know about electricity by Mr+D+from+63 · · Score: 0

      Its not the good cells that are the problem. Out of thousands that people have scavenged from all over, you can bet their will be many that won't last long.

  3. And how much is your fire insurance premium? by Anonymous Coward · · Score: 1

    Just asking...

  4. Other sources of cheap batteries by Andrew+Lindh · · Score: 5, Funny

    I think there's a huge stash of "almost new" Samsung Galaxy Note 7 batteries that aren't being used now.

    1. Re:Other sources of cheap batteries by 93+Escort+Wagon · · Score: 4, Funny

      I think there's a huge stash of "almost new" Samsung Galaxy Note 7 batteries that aren't being used now.

      I've got a few crates of them stored away for winter. It's gonna slash my heating bill by 70%!

      --
      #DeleteChrome
    2. Re:Other sources of cheap batteries by asicsolutions · · Score: 1

      They'll look particularly nice around the holidays. Just install them in your fireplace and gather the family around. Chestnuts roasting on the Galaxy Note 7 open fire...

    3. Re:Other sources of cheap batteries by roc97007 · · Score: 1

      If you can get past the smell.

      --
      Oliver's law of assumed responsibility: If you're seen fixing it, you will be blamed for breaking it.
    4. Re:Other sources of cheap batteries by 93+Escort+Wagon · · Score: 1

      I work in IT - I got used to bad smells long ago.

      --
      #DeleteChrome
    5. Re:Other sources of cheap batteries by __aaclcg7560 · · Score: 1

      Be sure to store unused Samsung batteries in fire-proof and explosion-proof storage bags.

    6. Re:Other sources of cheap batteries by HumanWiki · · Score: 1

      I think there's a huge stash of "almost new" Samsung Galaxy Note 7 batteries that aren't being used now.

      Just surround them with thermoelectric generating materials and you'd do fine... Hell, you'll probably get a credit back from the local utility company.

    7. Re:Other sources of cheap batteries by Anonymous Coward · · Score: 0

      Don't feed the whales, foks! It has to learn to hunt and feed by itself!

      Direct Amazon link!

    8. Re:Other sources of cheap batteries by roc97007 · · Score: 1

      If the smell you've gotten used to is smoke escaping from batteries, someone is doing something wrong.

      --
      Oliver's law of assumed responsibility: If you're seen fixing it, you will be blamed for breaking it.
    9. Re:Other sources of cheap batteries by Anonymous Coward · · Score: 0

      Trim off the fingerprints, man.

      https://www.amazon.com/gp/prod...

    10. Re:Other sources of cheap batteries by Anonymous Coward · · Score: 0

      Actually they're perfectly safe... unless you put them in a case that does not have the requisit space for expansion/contraction. Which brings us back to the Note 7 and it's oh-so-slender design.

  5. Yeah.... by Anonymous Coward · · Score: 0

    I have to turn my chair this way now ( turns away ). Just because you can do something doesn't mean you should.

  6. Subject: Fire by Anonymous Coward · · Score: 1

    Dear Sir/Madam, I am writing to inform you of a fire that has broken out on the premises of 123 Cavendon Road... no, that's too formal.

    [deletes text, starts again]

    Fire - exclamation mark - fire - exclamation mark - help me - exclamation mark. 123 Cavendon Road. Looking forward to hearing from you. Yours truly, Maurice Moss.

    1. Re:Subject: Fire by Anonymous Coward · · Score: 0

      you should get upmodded to 5 immediately. Of course, Slashdot isn't what it used to be...

  7. They're full of 18650's. by Anonymous Coward · · Score: 1

    I run my flash lights, USB battery packs, and e-cigarette with 18650 cells salvaged from old laptop batteries. And working in IT gives me an unlimited supply of them.

    Of course, like fryer oil, they won't be free once enough people find a use for them.

    1. Re:They're full of 18650's. by CrashNBrn · · Score: 2

      High drain 26650's are the real schnizzle at about 5 bucks each.

    2. Re:They're full of 18650's. by Anonymous Coward · · Score: 0

      "Discontinued", silly!

      Darn.....

    3. Re:They're full of 18650's. by Anonymous Coward · · Score: 0

      I dunno if the cost is worth the energy density. Based on my limited experience a 26650 is not going to be stronger than two 18650s of similar quality. A $20 26650 will outshine a $1 18650 battery. The same is also true for a $20 18650 vs a $1 26650. Spoiler alert, the 18 and 26 in the battery is diameter of the cell in MM. 65 is the length in MM. the 0 is the shape but i guess it should be O not zero.

      My experience with them is thus.

      I watched some youtube videos. I went to lowes and got a $10 power tool pack with 6 18650 cells in it. I bought a flashlight that comes with and uses 18650 cells. I then powered my ham radio equipment with it (4 in series to get to around 16V and 4 in parallel to get the amp hours needed)

      Later you can scale up to maybe a battery for my bike. Or maybe an EV conversion of a car. Then maybe a power-wall type device.

      The good news is that in the time that it takes to make this work for me as a hobby the prices and technology should improve. Throwing away 1000 $5 26650's is horrible compared to throwing away double the number of free (or low cost) 18650 cells. Or you can change to the next discarded technology.

      Tesla is not valuable for the car, it's valuable for the battery tech. They will be selling batteries to other car makers.

      Go ahead and power your house on the grid if you are afraid/lazy/stupid but those houses burn down too.

  8. You'll shoot your eye out kid! by the_skywise · · Score: 1

    heh...

  9. While you joke... by Anonymous Coward · · Score: 0

    Those would probably be perfectly fine for use in a static enclosure.

    The problem that caused the fires was related to those battery packs being overflexed due to their size and the limited rigidity of the note 7 case for those size batteries was it not?

    1. Re:While you joke... by roc97007 · · Score: 3, Funny

      Those would probably be perfectly fine for use in a static enclosure.

      The problem that caused the fires was related to those battery packs being overflexed due to their size and the limited rigidity of the note 7 case for those size batteries was it not?

      I have a mental image of a house down the street exploding after a minor earthquake. The neighbors are all loafing around the sidewalk looking at the debris. "A-yep. Samsung batteries. Shouldna used 'em."

      --
      Oliver's law of assumed responsibility: If you're seen fixing it, you will be blamed for breaking it.
    2. Re: While you joke... by Anonymous Coward · · Score: 0

      loafing?

  10. Lithium batteries are not to be taken lightly by stikves · · Score: 4, Informative

    They are very power efficient, and also very dangerous:

    - Overcharge it too much: boom
    - Drain it completely, and then try to charge: boom
    - Puncture: boom
    - Overheat: boom
    - Make your own battery with cells you found around, and not use a good controller: boom, boom, boom

    Of course it is possible to use lots of cheap batteries, with a very good controller system. This is what Tesla does for its current cars. However the system needs to monitor each cell and pack, and have safety precautions to disconnect them if them become faulty.

    Basically, do not try this at home.

    1. Re:Lithium batteries are not to be taken lightly by Anonymous Coward · · Score: 1

      Basically, do not try this at home.

      So, I can still power my home with it, right?

    2. Re:Lithium batteries are not to be taken lightly by Anonymous Coward · · Score: 0

      You do know that the cell management hardware is available commercially.

      ICs with the smarts are available at very little cost as well. This is how it can be done at home.

      In every generation of people who ignore the 'no user serviceable parts inside' lable and who laugh at the 'warrantee void if opened' sticker there always seems to be a larger number of people throwing out good produce from the fridge because the sell buy has expired.

      Some people idea of risk is either pretty off or they know their own abilities well. But still don't forget to remember too remind yourself it's never too late to learn something new.

    3. Re:Lithium batteries are not to be taken lightly by rickb928 · · Score: 2

      - Overcharge - Good charging apparatus.
      - Drain it completely - Good charging apparatus and battery management, as noted in the article.
      - Puncture - Stop puncturing your powerwall cells, please, just as you don't twist off the natural gas connectors to see want's inside. Darwinian problem.
      - Overheat - battery management, and a thermostat
      - Make your own battery with cells you found around, and not use a good controller - yeah, doing it right is pretty much a Darwinian problem.

      --
      deleting the extra space after periods so i can stay relevant, yeah.
    4. Re:Lithium batteries are not to be taken lightly by PolygamousRanchKid+ · · Score: 1

      - Drain it completely, and then try to charge: boom

      Great, now that Slashdot knows this, "Da Terrorists" knows it as well.

      And the USA government will know it, and WILL ban laptops on flights.

      --
      Schroedinger's Brexit: The UK is both in and out of the EU at the same time!
    5. Re:Lithium batteries are not to be taken lightly by Anonymous Coward · · Score: 0

      On the one hand, it shouldn't be too hard to wire up a bunch of thermocouples and current/voltage monitors to make sure everything is operating properly. The thing about LiON batteries is they fail in relatively predictable ways. Current draw suddenly shoots up? Cut the power. Batteries giving off an increasing amount of heat while discharging? Time to replace them. Also, I wouldn't be putting racks of these things on plywood, as the article shows. Cinderblocks would be best, or better yet a sand-box (sand absorbs heat really well.)

      On the other hand, when a cell phone recycling warehouse near my home caught fire a few years ago, they called in fire trucks from five surrounding cities to contain it. Luckily it was a stand-alone building, but it still took that many trucks to make sure the surrounding buildings didn't catch fire. They didn't even try to put out the warehouse itself. After a few hours of burning, there was nothing left of the warehouse but a pool of metal.

    6. Re:Lithium batteries are not to be taken lightly by burtosis · · Score: 2

      Basically, do not try this at home.

      So, I can still power my home with it, right?

      Yes you could but it's like giving a 4yr old the controls to a 20 ton front end loader in your backyard. I'd rather a trained professional operate something capable of demolishing my home in minutes but to each their own.

    7. Re:Lithium batteries are not to be taken lightly by Rick+Schumann · · Score: 3, Interesting

      You've got it pretty much covered; Li+ cells are finicky at best, you do anything to make them upset and they get very violent with you very quickly.

      The main problem with using used cells from old laptop batteries is that they're not all the same age and therefore you have no way of judging what their true capacity or overall health is. If you were linking up the actual packs they're in, and using the built-on microcontroller-based charge-discharge controller to manage each pack, then it would be reasonably safe, but dismantling them from random packs and assembling them into huge banks? You're asking for disaster to happen. The best you could do there would be to have a very sophisticated management controller(s) monitoring smaller banks of cells, disconnecting them at the first sign of failure of any single cell in that bank -- and also a automated fire-supression system that can handle a catastrophic failure, and perhaps an explosion-proof enclosure for all the banks of cells. Li+ cells may be ubiquitos at this point in time, but they're still far from Amateur Night to work with, especially in the huge quantities these guys (who, according to the article) are indeed complete amateurs. From what I know of it (and I worked somewhere where I did quite a bit of research into the subject of building Li+ battery packs), if they were buying new cells in those quantities, the manufacturer might insist on seeing their controller design(s) before accepting the purchase.

    8. Re:Lithium batteries are not to be taken lightly by WaffleMonster · · Score: 1

      Of course it is possible to use lots of cheap batteries, with a very good controller system. This is what Tesla does for its current cars. However the system needs to monitor each cell and pack, and have safety precautions to disconnect them if them become faulty.

      Yet they still catch fire and the same batteries used in vehicles are being used in power walls installed in homes.

      - Overcharge it too much: boom
      - Drain it completely, and then try to charge: boom
      - Puncture: boom
      - Overheat: boom
      - Make your own battery with cells you found around, and not use a good controller: boom, boom, boom

      Do all of these with lithium iron phosphate and worse case your battery turns into a paper weight.

      The problem in my view isn't cheap batteries and controllers as much as the industries love affair with inherently dangerous chemistries and hoping for the best.

    9. Re:Lithium batteries are not to be taken lightly by Anonymous Coward · · Score: 0

      You of course are blindingly ignorant to the 60's and 70's and 80's when this stunt was done before and already demonstrated to fail. Yes, it's completely plausible, but it's also got enough edge cases that a ton of amateur hazmat turns into a bad idea.

    10. Re:Lithium batteries are not to be taken lightly by Anonymous Coward · · Score: 0

      Yeah even "pros" at Batteries Plus will replace NiMH cells but won't touch Li+... not sure what chance the amateurs have of long term success...

    11. Re:Lithium batteries are not to be taken lightly by idji · · Score: 1

      now go and watch Jehu on youtube and see that he knows all of this very well.

    12. Re: Lithium batteries are not to be taken lightly by Anonymous Coward · · Score: 0

      A BMS with temp monitoring takes care of charge/discharge dangers. Individual cell fuses take care of shorts. Li batteries can do crazy things but the conditions under which they do them are well known and mitigated in all sensible designs.
      They are not unpredictable.

    13. Re: Lithium batteries are not to be taken lightly by Rick+Schumann · · Score: 2

      Sure. When you start with nice new cells, but not with worn-out shitty old cells from old laptop battery packs. You're literally playing Russian Roulette when you do. You're underestimating what thermal runaway in a Li+ cell can cause; one internally shorted cell dumping it's entire charge can and will cause a cascade failure, setting off adjacent cells into thermal runaway also, which just continues until the entire bank is a fireball. Not. Worth. The. Risk.

    14. Re:Lithium batteries are not to be taken lightly by bongey · · Score: 1

      Well this could happen with ANY LI+ battery system, even the Tesla powerwall. Lithium batteries always have a fire risk compared to other battery types.

    15. Re:Lithium batteries are not to be taken lightly by Rick+Schumann · · Score: 1

      They're ignorantly taking a huge risk on the confidence of others who have managed to not have a fireball erupt in their garages. Sooner or later someone's house will burn down because of this.

    16. Re: Lithium batteries are not to be taken lightly by drinkypoo · · Score: 1

      I'd be a lot more worried about counterfeit cheap crap batteries than I would be about old batteries originally used by reputable vendors, once tested.

      --
      "You're right," Fisheye says. "I should have set it on 'whip' or 'chop.'"
    17. Re:Lithium batteries are not to be taken lightly by tidepool · · Score: 1

      Ohh.
      Thanks for the heads up!

    18. Re:Lithium batteries are not to be taken lightly by Synon · · Score: 1

      Cows kill 22 people a year, they must be dangerous too right? I've built several battery packs using old laptop cells, so long as you monitor them (which literally everyone who uses these does) you will not have a problem. I've done destructive testing using all the tests you list, the result has always been less than spectacular. I expected hammering a screwdriver through a cell would give me a show, but they do little more than a little hiss and get warm to the touch. RC lithium pouches can be very explosive, modern 18650's from name brand laptops... not so much. Plus many of us take precautions like individually fusing each cell in addition to monitoring parallel strings of cells, worst that will happen is a cell will burn through a fuse. No offense, but you have no idea what you are talking about.

    19. Re: Lithium batteries are not to be taken lightly by Anonymous Coward · · Score: 0

      Yup. If one cell can internally short and ignite in a diy build, it can do the same in a laptop, and manufacturers have worked very hard to make this not happen. Fusing cells prevents a short from affecting its neighbors electrically.
      Do genuine cells ever develop a dead internal short capable of passing high current? Apart from physical damage or gross overcharging I don't see that happening. Normally they just develop a too high self discharge rate (which any serious builder tests for and discards).

  11. Sounds good on the surface but by burtosis · · Score: 4, Insightful

    The problem with using laptop batteries is not the batteries, the tesla uses them. The problem is the smart battery circuitry needed to monitor currents and voltages, balance cells, thermally monitor strings (or ideally individual cells), gas gauge, and safely disconnect problem cells from the system. The major advancement in the tesla is the amazing cooling/heating system and the ability to rewire itself to stop using problem cells. Simply wiring up a bank of unmonitored cells is a disaster waiting to happen. The vast majority of home hobbiests lack the knowledge and wherewithal to implement proper battery safety. The packs in the stock photos, if lithium cells, are a disaster in the making. Disclaimer: have designed smart battery circuits for lithium batteries used in actual products.

    1. Re: Sounds good on the surface but by Anonymous Coward · · Score: 0

      The packs i the stock photos are voltage and temperature monitored, and the connecting wires are dimensioned to melt if a cell shorts.

    2. Re: Sounds good on the surface but by burtosis · · Score: 1

      We are looking at different photos, not sure which you even mean. I see dozens of batteries hard wired with heavy copper strips and short heavy copper wire in parallel, ones with lower internal resistance will be used disproportionately, there is no thermal monitoring or any way to remove one that Develops a short internally. FFS I have personally seen a fire almost burn down a building from loose lithium cells thrown stupidly in a box exactly as shown. Yes if one person does this crazy shit nothing bad may happen but as that number climbs past 10 the odds of at least one disaster approach 100% quickly.

    3. Re: Sounds good on the surface but by rickb928 · · Score: 1

      "dimensioned to melt"

      Functional equivalent: fuses. Problem solved.

      --
      deleting the extra space after periods so i can stay relevant, yeah.
    4. Re: Sounds good on the surface but by Rick+Schumann · · Score: 1

      Yeah, we're seeing the same things. The problem with banks like that, is that if one cell goes catastrophically south on you, it 'triggers' adjacent cells, and so on, into a cascading failure that takes out the entire bank, and maybe your house with it, as the whole bank dumps it's entire total charge into one big fireball. Not theoretical, either, I've seen video taken of this sort of failure occurring in a lab setting.

    5. Re: Sounds good on the surface but by gweihir · · Score: 1

      Most people do not understand risk and risk management as done in professional engineering. These people all have no formal EE training and some apparently have no formal training at all. Hence they probably feel pretty smart for "showing the professionals how it is done" and are completely unaware and would not understand anyways why the actual experts go to all that trouble needed to make this safe. They will find out by repeating the history they are unaware of.

      --
      Most ACs are not even worth the keystrokes to insult them. Be generically insulted by this and ignored otherwise.
    6. Re:Sounds good on the surface but by networkBoy · · Score: 1

      IIRC every parallel element in a Li pack should be monitored and individually controlled, correct?

      so I can have 100 cells in 10 strings of 10 and would need 10 controllers* to monitor said pack.

      Then the parallel pack itself can be treated somewhat simply as a larger battery equivalent (e.g. if each of the hypothetical strings is 1Ah then I can treat the pack as a single 10Ah battery). The danger comes into play when cells are in parallel without protection, as then the stronger cell can actually damage the weaker cell in boundary conditions, leading to over depletion and over charging situations.

      *in this case controller is specifically:
      LV cutoff to prevent over depletion of string
      Charge current limiting
      HV cutoff
      possibly max current drain too.

      --
      whois gawk date unzip strip find touch finger mount join nice man top fsck grep eject more yes exit umount sleep dump
    7. Re:Sounds good on the surface but by burtosis · · Score: 1

      IIRC every parallel element in a Li pack should be monitored and individually controlled, correct?

      so I can have 100 cells in 10 strings of 10 and would need 10 controllers* to monitor said pack.

      Then the parallel pack itself can be treated somewhat simply as a larger battery equivalent (e.g. if each of the hypothetical strings is 1Ah then I can treat the pack as a single 10Ah battery). The danger comes into play when cells are in parallel without protection, as then the stronger cell can actually damage the weaker cell in boundary conditions, leading to over depletion and over charging situations.

      *in this case controller is specifically: LV cutoff to prevent over depletion of string Charge current limiting HV cutoff possibly max current drain too.

      Close but no. As another poster pointed out a single failure in that parallel pack, if shorted causes a cascade like failure of every cell in parallel discharging at unsafe levels and likely results in a fire. If a cell goes high resistance or open the others have to work harder (supply more current per cell) to keep the same load and can be thermally stressed and fail by temperature overload - you need balanced cells with internal resistance and capacity to be nearly equal as imbalance likely from used random cells means one or two may be heavily overworked and others no so much. A single thermometer won't help. Plus your pack will have greatly reduced capacity from a single cell, because your pack will shut down when that parallel pack cuts off at LV (or thermal limits) prematurely. In well engineered packs it gets really fancy with much more than just low and high/voltage, charge/discharge current and low/high thermal limits.

    8. Re: Sounds good on the surface but by bestweasel · · Score: 1

      One of the photos looks like they were testing individual cells, a necessary process but tedious for more than a few.

      The thin wire in the bus bar video will fuse at about 10A so I guess that's the current protection for each cell though as each module can only be monitored as a unit, unless the fuse or the cell itself blows there's no way to find which of the 80 cells have failed without unsoldering them. All I've read says soldering to 18650 cells will damage them which makes me wonder how competent the guy is.

      For a fixed installation, the batteries could be immersed in an inert liquid for cooling and fire suppression.

    9. Re:Sounds good on the surface but by Areyoukiddingme · · Score: 1

      The problem is the smart battery circuitry needed to monitor currents and voltages, balance cells, thermally monitor strings (or ideally individual cells), gas gauge, and safely disconnect problem cells from the system.

      Fortunately Tesla says you can use their battery management system patents royalty free. I haven't read them, so I don't know if they're typical useless patent dreck or not, but at least in theory, there's detailed documentation on the industry-leading many-cell pack and its safety systems, which so far have proven to be fairly impressive. Even if it's only the typical hand-wavy description, it should at least provide a hint about how to handle all of those things you mentioned.

    10. Re:Sounds good on the surface but by Cramer · · Score: 1

      Tesla modules cannot "rewire themselves". Individual cells are connected in parallel via low current fuse wires. The hope is the fuse will open if there's ever anything wonky in any individual cell. There are a few thermistors in the pack going to the mini-BMS board in the module; that board is *part* of the BMS, not a free running BMS in itself.

      Hobbyists should follow this design. However, we've all seen the idiots welding dozens of batteries together with strips that could carry hundreds of amp before failing. And of course, no one bothers with the expense or complexity of a real BMS. The only thing keeping 99% of these people alive is the internal safety valves in commercial cells. (Tesla cells do not have those!)

  12. Extremely Hazardous by LeftCoastThinker · · Score: 2

    Unless these people built a cinderblock bunker roofed with a galvanized steel roof (i.e. no wood in the structure at all) and a steel fire rated door that is completely removed from their main residence, the first time one of these Lithium batteries fails thermally, their entire "wall" will likely go up and burn down their house. If they have each battery in a ceramic, isolated cubby outside their house, they are marginally better, but this is definitely not a good way to go about powering your house or living off grid... You are better off building your own lead acid battery array with deep cycle batteries...

    --
    If you disagree, please post your argument. (-1, Overrated) isn't your personal censorship tool for views you don't like
    1. Re:Extremely Hazardous by pr0fessor · · Score: 1

      I was going to say aren't the deep cycle batteries used more often for this? of course you get over 100Ah and they start getting expensive.

    2. Re: Extremely Hazardous by Anonymous Coward · · Score: 0

      Amén. And good luck getting the insurance company to pay out if there's any kind of a fire!

    3. Re:Extremely Hazardous by Lord+Kano · · Score: 1

      My ex-wife's dad used to have a whole house UPS built from a rectifier, inverter, charge controller and a bunch of deep cycle batteries.

      LK

      --
      "Hi. This is my friend, Jack Shit, and you don't know him." - Lord Kano
    4. Re:Extremely Hazardous by LeftCoastThinker · · Score: 1

      Yes, that is the standard approach, and for good reason. There is no reason you can't build your own battery bank though. (Very few people have the technical skill to build a battery charge/discharge balancer though.)

      --
      If you disagree, please post your argument. (-1, Overrated) isn't your personal censorship tool for views you don't like
  13. quotes by Anonymous Coward · · Score: 0

    When I reached out to the laptop manufacturers, both Dell and HP discouraged hobbyists from reusing their batteries. "Dell laptop batteries are designed to be used within Dell-branded products only and we do not recommend or endorse any other use," a spokesperson from Dell told Motherboard in an email.

    And they shouldn't. Companies can't dance this legal knife's edge, endorsing alternate battery usage, on the hope that DIYers* know what they are doing and the pinky promise that they or their families won't sue if they get hurt by fucking around with batteries.

    *Some DIYers are very competent and understand engineering for safety, and may in fact be engineers. Some DIYers are very enthusiastic idiots.

    1. Re:quotes by Mr+D+from+63 · · Score: 1

      When I reached out to the laptop manufacturers, both Dell and HP discouraged hobbyists from reusing their batteries. "Dell laptop batteries are designed to be used within Dell-branded products only and we do not recommend or endorse any other use," a spokesperson from Dell told Motherboard in an email.

      And they shouldn't. Companies can't dance this legal knife's edge, endorsing alternate battery usage, on the hope that DIYers* know what they are doing and the pinky promise that they or their families won't sue if they get hurt by fucking around with batteries.

      *Some DIYers are very competent and understand engineering for safety, and may in fact be engineers. Some DIYers are very enthusiastic idiots.

      Seems like they could sign a waiver and take care of that part. I think another worry, and possibly a bigger one, may be finding a bunch of them improperly disposed of and getting blamed for it. Hard to sign that away in a waiver because the cells are not traceable.

  14. Nickel-Iron Battery by Anonymous Coward · · Score: 1

    Most power my home with DIY batteries folks use the Nickel-Iron Battery.

    It's not the most efficient battery, but it tolerates abuse (aka DIY stupidity) and usually doesn't explode unless you do something really dumb.

    Trying this DIY approach with Lithium batteries?
    Let's not and say we did.

    1. Re:Nickel-Iron Battery by Anonymous Coward · · Score: 0

      Stupidity and outright lying is high at Slashdot today.
      "Most power-my-home-with-DIY-batteries folks" use _Lead Acid_, as has been used for fucking generations. That is what I use for my second home, and _everybody_ around me who does this is using the same. (Second home is in a Marina.) They are far cheaper new than even used Li-Ion cells, they are safe and reliable, and the Recycling Infrastructure for them has been in place for a long time.
      A ~3KWh deep-cycle Lead Acid Battery bank comes in under $300, about a tenth of the price of the more modern alternatives, like NiFe from Iron Edison.
      You don't know what the hell you're talking about, you twat.

    2. Re:Nickel-Iron Battery by fnj · · Score: 1

      Careful. NiFe blows off hydrogen when charged. Hydrogen will explode from a tiny spark.

  15. Ah, you might want to rethink that one by Anonymous Coward · · Score: 1

    Your powerwall might turn into a firewall

  16. This too will become illegal... by Cheerio+Boy · · Score: 0

    ...eventually. Either the NIMBY people will get all concerned that "Something might go wrong!" "What if it catches on fire?!" "There's no way that can be environmental or legal!"

    OR

    The energy companies will lobby to REQUIRE that federal law prohibits re-using the cells from internally sealed battery packs as "They just aren't safe!". They'll cite public battery fires and MSDS listing the "Volatile internal chemicals!" in the batteries that are safely contained UNLESS OPENED.

    These power walls are far too easy to convert for solar or wind use so you can be sure they represent a threat to the power companies. You can bet that they will try and squash any attempt to get away from a completely dependent energy system.

    --

    "Bah!" - Dogbert
    1. Re:This too will become illegal... by Anonymous Coward · · Score: 0

      No need for a conspiracy theory. Your homeowner insurance already specifically excludes the storage of hazardous flammable a, and the fire protection code specifies an installation, which the people clearly blew off. Oh, and complying with the fire code is already a law in every state of the Union, only question is which version of the code. Oh, and municipalities won't specifically ban his idea until some thoughtless tinkerer poisons a neighborhood with toxic smoke. No different than the chicken ban in town being enforced because of some asshole with a rooster.

  17. Why.... by Anonymous Coward · · Score: 0

    Just get a large amount of lead batteries or something. At least those don't have a tendency to blow up at the slightest thing.

    1. Re: Why.... by Anonymous Coward · · Score: 0

      Yes, they do. They make hydrogen gas when overcharged. Some relatives of mine blew up a truck battery a month ago because they tried to charge it after it was frost-damaged.

  18. Why by Anonymous Coward · · Score: 0

    Why spend all that money on expensive solar panels and inverter, then buy used laptop batteries?
    Laptop batteries can't even power the laptop after a year or two, so why the hell would you use them to power your house?
    Get some big heavy lead acid batteries (that cost less) and power your house with those. The size and weight aren't critical when you have an entire house to store them in. Also, they tend to fail much more safely.

    1. Re: Why by Anonymous Coward · · Score: 1

      Broken laptop batteries often have some perfectly good cells inside, and they are free or next to. Lead-acid is heavy, wears out quickly and is not that efficient.

  19. Fire hazard by Anonymous Coward · · Score: 0

    Hopefully they're designing in some cell balancing and safety factors into these things. Though push comes to shove you could simply place you battery pack in an enclosure a short distance from your house. The bigger issue I'd guess would be the longevity of the cells, most laptop batteries are built to some pretty low standards and little if any health management so they tend to burn out quickly. They might cost quite a bit more but the large battery packs currently being made (like the Powerwall, car battery packs, etc) seem to be designed with major emphasis on longevity.

  20. WTF!?! by Shotgun · · Score: 2, Interesting

    Where are they getting these used laptop batteries that still have life in them?

    My experience has been that a typical laptop battery will last about 2 years. 3 if you're will to work in small spurts before hunting down a power outlet. Most are run till the batteries are useless, and then spend a while as a makeshift desktop by constantly being connected to the charger. In a couple cases, the laptop was still useful enough to spring for a replacement battery.

    I just don't see where enough recycle-able batteries will come from for this "movement" to ever be anything other than an oddity. With the tedium of:
    - connecting hundreds of cells that you've already determined are not new, if not at the end of their usable life
    -purchasing or building your own controllers with failsafe features
    -replacing cells as they begin dying off

    I would think it would make most people opt for buying one of Tesla's products.

    --
    Aah, change is good. -- Rafiki
    Yeah, but it ain't easy. -- Simba
    1. Re:WTF!?! by skids · · Score: 1

      My bet would be that most packs fail in one bad cell, leaving several good cells remaining.

      My real question is, where are you getting laptop batteries with cylindrical cells? I thought they were all pouch over the last decade or so due to the thin craze.

    2. Re:WTF!?! by Nethemas+the+Great · · Score: 1

      From what I understand the batteries that power electronics aren't dead per-se, but just outside the spec necessary to power the original device as intended. If you understand the characteristics of the battery I would expect you could still build around that to get something useful.

      --
      Two of my imaginary friends reproduced once ... with negative results.
    3. Re:WTF!?! by Anonymous Coward · · Score: 0

      Where are they getting these used laptop batteries that still have life in them?

      My experience has been that a typical laptop battery will last about 2 years. 3 if you're will to work in small spurts before hunting down a power outlet. Most are run till the batteries are useless, and then spend a while as a makeshift desktop by constantly being connected to the charger. In a couple cases, the laptop was still useful enough to spring for a replacement battery.

      I just don't see where enough recycle-able batteries will come from for this "movement" to ever be anything other than an oddity. With the tedium of:
      - connecting hundreds of cells that you've already determined are not new, if not at the end of their usable life
      -purchasing or building your own controllers with failsafe features
      -replacing cells as they begin dying off

      I would think it would make most people opt for buying one of Tesla's products.

      Generally you see just one or two cells in the laptop battery go bad. Reducing the function of the entire battery. Harvesting the remaining "good" cells is where they are sourcing the parts for the project.

      Jehu Garcia has some interesting videos on Youtube. Like others posted this is a fire waiting to happen. There are some videos of them taking tesla car batteries and putting them in cars as battery powered "Hot Rods". Very cool but I'm sure will be illegal soon enough.

    4. Re:WTF!?! by DrXym · · Score: 1
      Battery storage didn't start with Tesla and I'm sure other solutions in a similar form factor will appear from other major manufacturers. Building banks of batteries into safe, reliable storage is obviously something that can be highly automated and the cost is only going to come over time.

      But I don't see why anyone would want to do this for themselves. What they save in money they must surely lose in time and house / injury claims if their house goes up in smoke.

    5. Re:WTF!?! by networkBoy · · Score: 1

      one bad cell in the pack can render the entire pack useless.
      TFA says they test each cell through a discharge/charge cycle, my guess being that they cull the horrible ones, and bin sort the rest.

      --
      whois gawk date unzip strip find touch finger mount join nice man top fsck grep eject more yes exit umount sleep dump
    6. Re:WTF!?! by Ramze · · Score: 1

      Depends on the battery configuration, but usually they have multiple batteries set in a parallel configuration. If a battery cell on the first rail completely dies, you can still get the proper voltage from the second rail, but you now have half the battery life. Some people will change out the battery at that point, others will wait until a battery on the 2nd rail fails and battery power goes to zero or insanely short like 3 mins of charge. There might be 6 good batteries and 2 bad batteries in the pack at that point.

      Sometimes multiple cells partially fail, so they'll have to test each battery in the pack to know which ones are good... but, generally just because the pack is useless doesn't mean all the batteries inside the pack are useless. The odds are that most of them are still good as the day they were made, but the pack wasn't designed to re-wire itself to provide the power from the good batteries while disabling/removing the bad ones as they fail.

    7. Re:WTF!?! by thegarbz · · Score: 1

      Where are they getting these used laptop batteries that still have life in them?

      They aren't. They are getting used laptop battery cells that still have life in them. Most laptop batteries will typically be dead when only one cell has crapped itself.
      Charge and discharge test each individual cell and dispose of the faulty one.

    8. Re: WTF!?! by Anonymous Coward · · Score: 0

      That's what I did for my ebike battery. Any cell that got hot, self discharged too much, or had too low capacity got tossed. Then I took the 80 highest capacity cells and sorted them into 10 groups of 8, using Excel to balance the groups until they were equal in capacity to witnin .02% (because I could). A BMS sees to it that no group goes outside the safe parameters of current and voltage, and I charge and discharge the cells at a rate lower than what they got in the laptops they used to power.

    9. Re:WTF!?! by bongey · · Score: 1

      With laptop batteries only one cell has to go bad for it not to work with a laptop, the rest of the cells are usually still good.

  21. liability by Anonymous Coward · · Score: 0

    So these guys would rather build their own powerwalls and be left holding their dicks when their house burns down rather than 1) having a giant, deep-pocketed corporation to sue, and 2) actually being able to collect an insurance settlement because they are buying a regulated, tested product?

    I get the DIY ethic, but talk about penny wise and pound foolish!

  22. Zinc batteries are to be taken lightly. by Anonymous Coward · · Score: 0

    Well now it must be a good thing Zinc batteries are coming along.

  23. blip by John.Banister · · Score: 1

    bad mod

  24. Just wait a few years! by Gravis+Zero · · Score: 1

    In a few years, all the thermal issue with lithium batteries are going to be a thing of the past. If not for improved safety then you should at wait because the new batteries are going to cause the price of the preset battery forms to plummet. Before installing this shit, do check with your insurance company to see if they will cover you if a battery fire does burn down your house because when one battery goes, they ALL go.

    --
    Anons need not reply. Questions end with a question mark.
  25. Disaster waiting to happen by Anonymous Coward · · Score: 2, Informative

    If one of the laptop battery is on recall list that's one ticking fuse in your powerwall

  26. Example of knowledge level on diypowerwalls.com by Anonymous Coward · · Score: 0

    From a discussion thread on "Making-use-of-surplus-power-HHO-electrolysis", you'll find this tidbit:

    "I think there's more going on with HHO than just plain electrolysis ..... the video above goes into it well .... a totally unknown 'ohmasa gas' is being produced ... it's water , but has a high energy toroidal structure ... when hit by the spark in an ICE it implodes into a 'plasmoid' and accesses zero point energy."

  27. stupid, dangerous, inefficient. by Anonymous Coward · · Score: 0

    Just get some giant ass 2 volt lead acid batteries. Much safer and longer lasting.

    Within 5 years one of these ijits will burn their house down due to lithium failure. bet.

    1. Re: stupid, dangerous, inefficient. by galfisk · · Score: 1

      Lead acid is inefficient and short-lived. And when they go bad they can swell, crack, leak or even explode. If overcharged, they vent a perfect mix of hydrogen and oxygen that will ignite from any spark. If not kept near full charge they will go bad over time. Discharged batteries are frost-sensitive because the electrolyte is theb modtly water. And since they are not as finicky as Li-ion they are often charged by crude chargers and not closely monitored.

  28. if i ever went off the grid by FudRucker · · Score: 1

    i would switch to 12 volt DC and use automotive electronics, like a car stereo for entertainment, lights meant for a camper motor home, just use coleman multi-fuel stove, no refrigerator, just keep my food storage as canned goods and dry goods

    --
    Politics is Treachery, Religion is Brainwashing
  29. 1 megawatt = 1000 kwh? by superdave80 · · Score: 2
    FTFA:

    The giant battery system will be able to store 1 megawatt of power—1000 kWh

    I... don't even know what to do with that sentence. Watts are not equivalent to kilowatt-hours.

    1. Re:1 megawatt = 1000 kwh? by Anonymous Coward · · Score: 0

      Most likely, some lazy bugger wrote "megawatt" instead of "megawatt hour". People do this all the time.

      Alternatively, some journalist just doesn't know what they're talking about. I would rate that about equally likely, but in this case explanation 1 is *so* common it's practically the default.

    2. Re:1 megawatt = 1000 kwh? by Anonymous Coward · · Score: 0

      I can spend an hour on the tower of power
      1 megawatt of power ~> 1000 kilowatt-hour

    3. Re:1 megawatt = 1000 kwh? by Anonymous Coward · · Score: 0

      Common core?

    4. Re:1 megawatt = 1000 kwh? by Anonymous Coward · · Score: 0

      Even if it means 1MW for an hour, I don't think my wiring can take 9000 amps, nor do I have an aluminium smelter to use all the power.

  30. What could possibly go wrong? by wonkey_monkey · · Score: 1

    Sounds good. Those things never explode, right?

    --
    systemd is Roko's Basilisk.
    1. Re:What could possibly go wrong? by Mondor · · Score: 1

      Of course not! These batteries were harvested by loving hands and made of perfectly natural organic lithium. This is the gentle touch of Mother Nature's power.

  31. How long is it going to last? by Khashishi · · Score: 1

    The battery in my laptop lasts only a few years before it's basically a brick. And they are using used batteries to build this thing?

    1. Re:How long is it going to last? by bongey · · Score: 1

      No usually only one cell is bad in you laptop battery, the rest of the cells are fine.

  32. Thanks Slashdot by Anonymous Coward · · Score: 0

    I was holding onto a bunch of old laptop batteries for that once in a decade trip to the local dump to drop off hazardous waste. Now that I know there's a market for them I'll just sell them all on eBay.

  33. Hmm. by sims+2 · · Score: 1

    I've got probably a 5 gallon buckets worth of bad laptop batteries i've yet to come up with a good use for them.

    --
    Minimum threshold fixed. Thanks!
    1. Re:Hmm. by Synon · · Score: 1

      Tons of uses. I built a battery pack for my ebike with some old laptop cells. 50+ mile range at tops out at 34mph, makes a great commuter, been putting on 300 miles every month and the cells have stayed in perfect balance.

  34. Regulations by Anonymous Coward · · Score: 0

    City codes, safety and fire inspections. EPA for hazard waste etc. Liability insurance cover?

  35. I have a better proposal by Mondor · · Score: 1

    I have a better idea. Let's get a hundred hamsters, and put them into a hundred wheels. Or maybe rats, as they are stronger. We can harvest rats in large cities and feed them with refuse. Wheels will provide with electricity whole houses, maybe even hospitals and schools! And it's clean, simple, efficient and powerful! It's natural, organic synergy! Where should I apply for a patent? Although I recall this idea was already featured in one of the Gummi Bears episodes, but this time it's for real!

  36. Seems too tedious... by martinfb · · Score: 1

    Looks like it'll take more than $3000 worth of work - time and materials - to make this a reasonable endeavor.

    However, more power to those that indulge! (pun intended!).

    --


    Self-importance and self-indulgence is the root of ALL evil.
  37. "supplying energy" by v1 · · Score: 1

    ... and turning them into powerful batteries capable of supplying energy to their entire homes.

    Pleas stop saying "supplying energy". Gas and coal are something that "supplies energy". Batteries store and release energy. (unless you're burning them and turning that heat into energy I suppose)

    You still have to charge them, storage isn't anything very incredible here. And old batteries can be pretty wasteful at that too. The manufacturers don't make the packs easy to take apart and separate the cells, and most of those packs have one or more cells that are performing much worse (or not at all) compared to the rest in the pack. You can't just chain together different grades of cells without introducing big performance hits, where you turn a lot of power into heat during charge and discharge due to the imbalance or bad cells in the string. If you want anywhere near decent performance you're going to have to tear the packs apart, separate the cells, test them, and group them together by current performance.

    And when you compare the storage capacity of these packs with say, the capacity you can get from a used battery at a junkyard, they immediately reveal themselves to be a very bad investment of your money and time. The only advantage laptop packs have right now is they're often free because large users (like schools and businesses) find it difficult to get anything for them and end up giving them away when they pull the bad ones to replace them with new. (or replace them on a rotating schedule, which increases your chances of getting a pack that's still got some decent cells in it) Schools are less likely to rotate out on schedule because they are more careful with their spending. Businesses are much more likely to swap out batteries on some sort of a schedule where batteries that are still mostly useful are being pulled out of use. The school I work at only throws batteries in the "battery recycle box" when they have dropped below 1/2 of original capacity. (and often only get noticed when they have failed completely or nearly completely, indicating a totally open cell or several failing cells at the very least)

    Comare the storage capacity of a new car battery and a new laptop battery. An average car battery is around 45 amp hours, which is a bit under 550 watt hours, which is what most laptop batteries are rate in. And the average laptop battery capacity is around 50WH, which is less than 1/10th that of a car battery. Now look at a typical used car battery you'd get at a junkyard for around $20. It won't have any bad cells either. (they won't bother trying to sell one that does because it won't start a car reliably with one or two dead cells dropping it to 8 or 10 volts) Then there's all the work involved in tearing apart old laptop packs, testing and matching cells, stringing them back together, setting up balanced charging... you'll quickly reach the $20/battery price point in supplies and added gear you could have spent at the junkyard. There's simply no chance of it possibly being worth it unless you think your time is free, and even then it just approaches break-even with lead acid, so you're just wasting your time. I don't consider my time free. Maybe if you're retired or something and looking for a hobby I suppose?

    --
    I work for the Department of Redundancy Department.
  38. "People" EQ maybe two three people. by Anonymous Coward · · Score: 0

    People are using their pets faeces to heat their houses.

  39. meanwhile in soviet Hellgium by KingBenny · · Score: 1

    i couldnt put a windmill in the yard because its "a hazard" ... using solar panels without passing it through the grid ( read 21% tax plus use and transfer costs and what not) is illegal and producing enough to store makes you technically "a provider" so thats also illegal unless you get a license which costs SO much you couldnt possibly produce enough from one home to make that viable
    and people always lol like you exaggerate and me like "well come live here then"

    --
    Free speech was meant to be free for all... how can anyone grow up in a nanny state ?