I'm using a Wal-Mart marine battery group size 24. I use a Battery Tender to charge it. I just let the charging plug stick out from under the seat to charge. It has enough juice to power my 3000 pound winch for any project I've needed it for, along with my lights, etc. The winch is connected directly to the battery with an inline circuit breaker. Everything else goes through the fuse panel.
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