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Unless I am completely misunderstanding the chemistry (a
possibility), battery charging should be endothermic and discharging
exothermic because of the associated entropy changes (hence the
recent phones catching fire problem). Does the cooling while charging
really happen in (all?) real batteries or is there something in the
engineering that changes this picture? Can anyone point to any data
or discussion? Seems like my phone and laptop get hot when
discharging AND charging.