The latest Tesla heat pumps can extract heat from the air to heat the battery and cabin down to -10C. Past that, they have to use resistive heating which is muc

The latest Tesla heat pumps can extract heat from the air to heat the battery and cabin down to -10C. Past that, they have to use resistive heating which is much less efficient. I would say that’s where the “cold” line begins, and of course the colder it is the more battery you have to waste. Last weekend I took a 3 hour round trip (starting with 90% charge) in -30C and had to charge only for 5 minutes to complete the trip.