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During the bulk charge phase, the batteries don't heat up much. Its when you want to get that last 10% out that things start getting warm. I would imagine internal resistance goes up as the battery gets more full. EVTV tested this out a couple years back with some CALB grey cells charging at some pretty high rate, 5C or so ? I forget exactly.
Discharging, they never really got warm/hot from what I've heard.
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