This is a newbie question, I am sure. My MS is in production and scheduled for delivery in early December. Not long after I will be away for a few weeks. It is winter in Chicago and while the car is in a garage, the temperature is cold. My question is - should I leave the car plugged in all the time I am gone? Are there any negatives from doing that? Alternatively leaving it unplugged - are there any negatives from doing that?