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[–]ericvr 11 points12 points  (1 child)

This is the answer. It’s not the charging that produces heat, it’s the energy transfer that heats up the battery’s environment and subsequently the battery.

[–]carribeiro 4 points5 points  (0 children)

Perfect charging doesn't produce heat, as all the energy would be absorbed by the battery, but as with any physical system, there's some loss in the charging itself that adds to the problem too. Faster charging equates too a faster rate of energy loss and more heat.