So, you need to make the call here. Is mid-winter recharging practical for you? Or, should you just disconnect the battery(s) so that there is no danger of a parasitic load discharging them too far while in storage. Of course if that is the choice, you'll have to reset all the pre-programmed stations on the stereo and such in the spring, but that really shouldn't be a big deal. Personally, I go for the full disconnect on my boat. I get a lot of years of service out of my batteries too.