I don’t think (don’t quote me on this) that the battery heats itself on its own. I think you need to either have it be actively charging or pre-heating the cabin and drawing power that way for it to actually stay warm.well i simply forgot to preheat my car last week, and paid for it. 26 degrees out and the car jumped to over 500 wh/hr a figure I had never seen in the car. I was playing catch up all day running around. Days after that the numbers dropped back down, when I pre-heated.
I thought if we left the car plugged in the battery would heat itself? I had turned the heat down to 65 to see if that would help much, but it didn't.
Is there a way to preheat washer fluid and or back window? Last weekend was my first dealings with heavy snow with the S. set it before I get out of the car?
Not sure about the washer fluid but at least on the 3, if the temperature outside/inside the car warrants it, it will turn on both the front and rear defrosters when turning on cabin heat. But this means you have to set an interior temperature that is sufficiently higher than the outside air.