FAA Reports Heat In Cargo Holds Can Ignite Laptop Batteries

SpuriousLogic writes "US aviation officials are warning air carriers that new research shows lithium batteries are sensitive to heat and can ignite in-flight if transported in cargo compartments that get too hot. The Federal Aviation Administration also acknowledged publicly for the first time Friday that a United Parcel Service 747-400 plane that crashed in Dubai last month killing both pilots was carrying a large quantity of lithium batteries. Since the early 1990s, there have been dozens of incidents of batteries igniting in flight. But it has not been known what triggered many of the fires. FAA now says recent research has identified heat as the trigger and is offering air carriers advice on how to reduce the risk of fire."

Comments

RTFA?

[nmb3000]

Wow, so apparently TFS == TFA (which in turn is nothing but a copypasta of an AP release from earlier today. Is there really no more information on this? For example, how hot is too hot? My laptop gets pretty freaking hot sometimes and I'd guess a fair bit of that heat finds its way into the battery.

Doing some quick looking, I came across a study which exposed lithium batteries to fire and heat (PDF). On page 32-34 it says (paraphrased):

- Heated cells vent flammable electrolyte gas
- Cells begin venting at approx 470-500 Deg F
- The electrolyte gas occasionally exploded
due to hot surface ignition
- Cells produce a pressure pulse when venting
- As little as four cells can raise the pressure in a
sealed 10m cubed chamber by one psi.

Kind of interesting. It looks like I probably don't need to worry about my laptop's head igniting the battery, but it does sound like either some batteries are a lot more susceptible to heat, or airplane cargo compartments get really hot. I would guess a lot of other stuff doesn't like being stored at those kinds of temperatures either. A quick look indicates most plastics melt at about 300-450 degrees F. In fact, ABS plastic (usually used in laptop battery enclosures) melts even lower at 221 degrees F.

~500 degrees F is hot.

So that is what happened to my batteries...

[Brett Johnson]

Several months ago, on a flight from Virginia to California, a zip-lock bag containing spare batteries for my phone and camera and several power&usb cables "disappeared" from my luggage. At first I thought I had left it behind, but that turned out not to be the case. A couple of months later, I had a nearly identical zip-lock bag in my carry-on (sans the camera battery, which I have not yet replaced). I was pulled aside for "extra scrutiny" specifically because of this bag. The TSA agent removed it, re-ran my luggage, and returned it to me. I can only deduce that the TSA "stole" my batteries and cables on the earlier journey, because nothing looks more like a bomb that a Nokia cell phone battery and a USB cable.