Us poor old northerns do have more work to do.. Iam on lake erie snow belt, so winter flying is a litte tuff but that's another story. All battery manufactors are pretty much consistant. Charge and keep cool as possable to slow discharge but lately just plain keep cold but that's Nixx's. Lead acid and Pb's must be maintain charged. Any battery that's discharged can freeze that is a bad thing. So bring into bedroom with wife she'll find a place for them. My garage sweats as temperature goes up and down then my planes get to damp in winter and warp, ask me how I know.. Me up here in winter land " Four inches of snow as I type" , charge , oil and drain tank then hang in basement and dream of spring HA HA