I left my Rv & Toad in alaska for the winter so I'm 6000 miles from the rigs. I fully charged the batteries then disconnected all the cables, so will they freeze and break open over the alaska winter? The batteries are group 27 12 volt 3 yrs old. Usually I would recharge the batteries 3 or 4 times over the winter months When electricity is present. But our temps don't go below 0 for more then a couple of days over the winter, not like alaska. What do other people do in cold weather conditions.