Some models do precondition the battery. Of those that do, if you leave the vehicle unattended for months you would notice the drain. Not over a few days though, the power drain is negligible compared to what’s needed to drive, or the increased range loss of a colder battery.

To put things in perspective: The average consumer EV can drive for 3–4 hours, but can power an entire household (including appliances) for 2 days.