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battery heat in a regen system is usually a net zero - they might give off heat on discharge, but suck a bit of heat on recharge. Also, battery life is VERY dependent on temperature, and keeping the batteries "warm" adds significantly to their temp.
On the motor, a permanent magnet very efficient motor does not put off that much heat.
Add all that up, and wintertime driving for an electric car is a definite problem.
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