big problem on the logic is that if i have budget for 15000€ car, i can´t afford 30000€ electric toy with common 40-50kwh......Don't know off the top of my head, but let's say it's a 4kW heater, the battery in an Audi e-tron is 95kWh, so even if it ran for an hour straight at full bore, consuming 4kWh, it's barely touched the battery.
Does it reduce range? Absolutely. but it's not as dramatic as you think it is. EV's are very well insulated (my e-tron was a tank) and so keeping the interior warm isn't like trying to heat a clapped out '84 Olds Wagon where you can literally feel the wind coming in the doors.
my old smartphone has 3rd lipo in it... because batteries swell over time and degrade...
and i do not store it outside in heat or freeze !! i hope people get my point.
anyways, guarantee is 160 000km or just 6years........