Those are being charged and discharged constantly, in some cases probably more than once a day.
I can't prove it, but I suspect that has something to do with it. There's probably also a lot of wear and tear on charging ports and other items, as well as the aforementioned hot charges.
Batteries aren't designed to take that kind of punishment. I have lost two laptop batteries just with normal use. Both swelled up like a balloon.
Yes. And this type of battery physically swells a little when charging - see the Samsung debacle.
Do that over and over and over without any rest periods and you run the risk of cracking a battery internally. A juicy class D fire happens, and everyone goes wut?
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