If the battery has no charge, it can and will freeze and break. For any tractor or vehicle not going to be used during a season, I take the battery cables off. My dad had a trickle charger on his '48 Packard, something shorted out, burnt their garage to the ground, house was stripped to bare studs and rebuilt (insurance wouldn't pay to tear it down!) So I either charge a battery or unhook it. I do have the solar charger from HF, it is on the machine shed roof, when I have the winch on the big trailer, I park it alongside the shed, hook the cables up, keeps the deep cycle marine battery topped off that way. Dad had the same charger on his pontoon boat for the trolling motor. A lot of people laughed until they saw his battery always being full and no down time. So, HF hasn't in my estimation messed with this to badly, just won't leave another appliance deliberately hooked up at my house that could potentially start a fire. How's that for going around the barn the long way in not giving a concrete answer to your question!?
God and family, the rest is icing on the cake.
I'm so far behind, I think I'm in first place.
Premier Bovine Scatologist
Host of the 2015 FAMILY WOODWORKING GATHERING