[drum55]

There are fire extinguishers and smoke detectors in the holds of aircraft.

[longislandguido]

Halon apparently, which is ineffective against lithium battery fires.

I'd rather not test this theory because of your cavalier attitude while I'm in a chair 40,000 ft over the ocean.

[herewulf]

It's effective against the rest of the combustible material in the hold so ideally the fire remains contained to the battery.

[majorchord]

Li-ion fires do not require external oxygen, the cathode decomposes to release its own oxygen gas during thermal runaway... fire extinguishers will not stop it.

[petre]

Except you can't extingush a lithium cell fire because it has the oxydizer inside. Once you see one you'll understand. It's scary.