Battery heating is not the same as cabin heating. To pre-heat the cabin, the HVAC system is engaged, and yes that uses traction battery power. If the car is plugged in, then external power should be used. Battery heating is solely to warm the cells for more optimum performance, both during driving and while charging. Batteries also have some sort of cooling system. Usually liquid cooled, but some cars use passive cooling, such as the Leaf. And if you're in a hot climate, passive cooling is not ideal.
2019 Kia Niro PHEV EX Premium
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