I had an Everstart. I sold it with my trolling motor. I had it for 3 years and the day I sold it, it was still nearly fully charged after sitting in a shed all winter. Just remember that those deep cycle batteries are different, and that you need a charger that is compatible. Keep it off the ground when it is stored. I don't know why you would need two, the big ones last pretty long.

A couple years ago the Wal Mart batteries were a Consumer Reports best buy.Very highly rated.

Interstate batteries in Everett is where I go. New factory blems are 50% off and they carry the full Interstate warranty.