jdc1 wrote:
What do car dealers do with the cars sitting on their lots all winter? Probably disconnect the battery and put it in warm storage on a trickle charger. And nothing else.
I worked at a car rental place and business was much slower in the winter and we often ended up with cars parked for months under the snow. We just kept the excess cars on the back lot and jump started them as needed with a portable battery that we wheeled out on a hand truck. The gas tanks were all full, but took no other special care or preparation.