Right now there is a marine type 12v, Im not sure how the best way to keep it charged is. I camp about once a month for long weekends and 2 week long trips in the summer. When I get home I usually do nothing with the battery. Then a few days before the trip I hook up the dog bone to the outlet in my garage, this charges it enough to get through a short non hook up camping stay. Like said previously this year we will be doing a lot more and longer non hookup camping. I do have a trickle charger, but must say was always a little afraid of having that thing charging in my garage for nearly a month at a time. I too would have enough room for at least two battery boxes in the tray. I thought about bringing the old battery and switching it out about three quarters the way through the trip. I do have a local golf cart shop and was thinking of starting there. Would the local Wal-Mart have anything usable. Most of what I saw there was Marine/RV types. How much should I expect to pay for a decent battery? Also how do I know how low the battery is going? I do not have a generator or anything to recharge while camping. Thanks again. Blams