My ESC is too hot?

The motor shaft does spin freely. I can easily spin the spur gear and drive train with a finger tip. One thing I'm realizing is that the temps were fine up to the end of the pack. Then the temps really spike. I usually stop before the LVC shuts things down.

I'm starting to think that maybe this is more of a battery problem. Maybe two 4s would cure the problem. They would at least cure the hot battery problem.

I still have to check the connections too, but I believe they are ok.