I put 4 Sam's Club golf cart batteries in my
catamaran based on good recommendations from fellow cruisers. In the last Seven Seas Cruising Assoc
equipment survey, Sam's Club golf cart batteries also received good ratings. For $46 a pop, you get a lot of amps for your dollar. Be careful hooking them up in series. I made a few sparks before I decided to diagram the hook-ups. Nigel Calder's mx book has some diagrams on how to do it.