When your not using the sled, just pull the battery out and leave it inside where it's warm. Or put a battery tender on it and plug it in when you get to where ever your going.
I put weather pack connectors on all my quads (i dont have sleds) and i take my batterys out if its really cold (im in the midwest so -5 is cold around here) or if im not gonna be on it for a few weeks, i then plug the weather packs into the corrisponding plugs on the battery tender
