At cold temps you lose range a few different ways:
First heat in an EV isn't free, this is usually where it gets you. People get in go "oh man its cold" and crank up the heat and there goes range. When you see one of the "this person ran out of power waiting in line at the Tesla charger in winter time" pictures this is how they did it.
Second battery efficiency goes down.
Finally, the battery usually is constantly doing the regen breaking thing but in cold weather it doesn't to save pack wear until you get the pack warm again
Second battery efficiency goes down.
Finally, the battery usually is constantly doing the regen breaking thing but in cold weather it doesn't to save pack wear until you get the pack warm again