What is the best way to keep batteries charged during the winter while in storage with no electric, I don't want to bring them home. Addendum: It is a FW with no Generator.
I take them out of the trailer and put them in my garage. I connect a battery charger to them every month for about 6 hours.
Batteries are still good - installed in the fall of 2011.
I check the water level and add as needed prior to charging. Only have to add water a couple times a year. Low water level can be a killer for the battery cells.