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Heated/insulated battery boxes are pretty common in northern EV conversions.
Regular use will also keep the batteries warm, especially if you use a timer so the car is topping up just before you're ready to use it. Charging generates heat (as does discharging), and there's a lot of mass in your battery pack -- esp. floodies!
I rarely drove/drive the ForkenSwift in the winter, but the hair dryer pre-warm was my preferred method for cabin heat. I was never going very far, so it never cooled down enough to be an issue before the trip was done.
Mainly I avoided winter driving to prolong the cars life (salt/rust).
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