Over here in sunny Southern California (U.S.), I recently parked in an indoor garage by LAX airport on a 5 day work trip. When I came back, I lost about 22 miles of range from just sitting. I did check up on the car, a Model 3, thru the smartphone app periodically while I was away, but I don’t think that would cause any noticeable drain on the battery even thought it says the car is ‘waking ‘ ?