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AFAIK, those things estimate charge based on voltage. If a battery heats up, it’ll have higher voltage. Not necessarily for a good reason…
Jokes aside, this is something an astonishing number of folks know less than nothing about.
Are you claiming to refute the hard evidence OP has presented?
Fire hazard speed run
I don’t think it would it be too bad since it’d have a current limiter would it?
My powerbank just detects that it is connected to itself and does jackshit.
Just buy another one and plug them into a ring.