Subject: Re: Battery 'leakage' while parked
There are better ways to find out than on a stock board, but Tesla says the answer is about 1% loss per day in warm weather, and up to 5%/day if it’s really cold (say, -25C) due to battery warming, since temperatures lower than-30C can harm the battery.

I didn’t know it was that much - maybe a factor in the decision to buy a Tesla if you live somewhere like Manitoba or Minnesota.