[VygmraMGVl]

You're in an enclosed tube with lots of people, so fire is a lot worse.

Most lithium ion battery fires in cabins are from loose vape batteries, probably shorting on keys or change.

Some are from crushing pouch cells in tablets or phones, sometimes by seats.

Besides that, there isn't anything about planes that is causing these fires.

[kitsunesoba]

I would imagine that the proliferation of cheap devices using lithium batteries also contributes to the issue somewhat. While anything with a lithium-ion battery is susceptible (as seen with the exploding Samsung Note debacle), bargain bin electronics are almost certainly not selecting batteries to as high of a standard as something with better profit margins, like an ultrabook or flagship phone.

Cheap chargers also likely contribute. There's limits to how much charger misbehavior even the best batteries can tolerate and some of the charger bricks sold on Amazon, in gas stations, etc are horrifyingly bad.

[londons_explore]

One contributor is that most batteries have a protective circuit built in. It usually has a DW01 chip and a pair of MOSFETs to prevent overcurrent charging, overvoltage, undervoltage, and overcurrent discharging, all for under a cent.

Since most batteries are protected, the cheapest chargers can be 'dumb', with a simple constant current output. When the battery is charged, the built in protection device will stop the charge when charged.

However, only most batteries have this protection. If you plug one of these cheap dumb chargers into a battery that doesn't have the protection circuit, then it will catch fire after a few hours.

[ziml77]

There really need to be rules in place to prevent these ticking time bombs that are cheap devices with 0 safety considerations or QA from being brought onto planes.

[Throw73849]

Yes, cheap devices are real problem. China has strict rules for transporting batteries that are actually enforced.