I drove my EV by -30 on Norway this month. Keeping about 19 degrees inside was using a lot of energy as cars aren’t well insulated.

The range is bad in winter but fast charging produces a lot of heat in the battery, you can see steam going from below the car while charging, that can then be moved to the cabin after. So long trips aren’t that bad. But you spend more, for sure. And you need a good winter EV. A lot of EVs on the market are terrible winter EVs.

Also, you don’t keep the battery warm all night as it would waste too much energy, but you should pre-heat the battery if you want descent battery performances immediately after you drive. On my car, it takes a few minutes while connected to the wall. I can start it from the phone or program it.