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Xiaomi's '100W' Quick Charging Goes From 0 To 100 In 17 Minutes (arstechnica.com)
Xiaomi is teasing a new 100W quick-charging solution for mobile phones that can fully charge a large 4,000mAh battery in just 17 minutes. Ars Technica reports: The video shows a charging race between two phones, Xiaomi's unnamed "100W" prototype and a phone with "50W" charging from "Brand O," which looks like it's an Oppo RX17 Pro. I put both of these wattage ratings in quotations because neither phone actually hits its rated charging speed. Xiaomi's video shows a live, in-line power reading, and the "100W" charging shows a sustained ~80W (18V / 4.5A) from about 5-30 percent, with a peak of 88W. The competing 50W Oppo quick-charge solution caps out at around 40W.
Branding aside, what matters is the actual charging speed, and Xiaomi's ability to fully charge a phone battery in 17 minutes is impressive. The test stops when the Xiaomi phone fills up, leaving the Oppo battery stuck at a mere 65 percent. Considering that Xiaomi was charging a 4000mAh battery and that Oppo only had a 3700mAh battery, Xiaomi's solution is about 1.6 times faster than Oppo's quick charge, which is currently the fastest charging scheme on the market. Unfortunately, Xiaomi didn't offer any specifics on how its charging solution works.
Branding aside, what matters is the actual charging speed, and Xiaomi's ability to fully charge a phone battery in 17 minutes is impressive. The test stops when the Xiaomi phone fills up, leaving the Oppo battery stuck at a mere 65 percent. Considering that Xiaomi was charging a 4000mAh battery and that Oppo only had a 3700mAh battery, Xiaomi's solution is about 1.6 times faster than Oppo's quick charge, which is currently the fastest charging scheme on the market. Unfortunately, Xiaomi didn't offer any specifics on how its charging solution works.
Whether that's time to discharge or time to replacement is left to the imagination of the reader.
they could be using multiple smaller bateries, each with its own controller. and charge them in parallel
Do they have any info on what that does to the life of the battery, as well as any potential fire hazards? Ah - just read the article - no they don't. No laws of physics have been violated. This will be harmful to the battery, and I would want to charge this in a Bat Safe.
The shepherds did so well protecting the flock that the sheep no longer believed that wolves existed.
Wireless charging is a convenience, hugely so for my crippled hands but one my able bodied friends enjoy as well.
Any modern home is full of conveniences we use without extra thought, no need to scoff at one in particular if people enjoy it.
As for quick charging; people seem to have their phones surgically attached to their hand and need to recharge by mid afternoon. I don't and personally prefer to keep the battery cool and charge overnight but to each their own.
Just don't charge them near me or anything I own, thx.
Assuming it is a Li-ion battery- 3.6V nominal and 4Ah there was 14 Wh stored in the battery. The charger used about 80W over the time 17/60th of an hour- about 23 Wh provided- so 9Wh ends up as heat, using a conversion- that means about 32000 J.
To put this in perspective- 12oz of water is about 340g, and the specific heat of water is 4200 Joules per kilogram per degree Celsius (J/kgC) so... 32000 J /(.340 kg * 4200 J/kgC) = 22C (72F) - not an insignificant amount of heat. Not crazy though.
it's just two batteries.
Nope.
Won't work.
Charging rate is expressed as a fraction of the battery capacities ("C").
Meaning that two smaller batteries, will also each charge at half the maximum rate.
So if you manage to charge them in parallel, you're back at the initial charge time.
Instead you need to tweak the chemistry and shallower charge cycles.
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