Originally Posted by
billdelong
Seen this happen to a guy who charged his batteries in a nice cool house, put all his charged batteries in the trunk of his car and after a couple hour drive to his favorite bashing spot, all his brand new packs in the trunk were swollen up like this because of the extreme change in temps... heat will increase the voltage of a LiPo which will cause them to swell.
i don’t doubt that it happened but I doubt that was the cause. When we discharge at high amperage, like 40 amps, it’s to generate this heat in the pack. Then when they are recharged, it maintains some of this heat and has a lower ir.