I have recommended this before and will do so again fyi. I have great luck with a bank o just two Optima Blue top D34 dual purpose deep cycle AGM batteries. They are slightly smaller and about 10 - 12 lbs each lighter and easier to handle than conventional flooded batteries. I now have one 4yrs old and the other going on 12 yrs. I periodically use a charger/maintainer in the off season garage storage. They are very expensive retail but about $250 delivered on line but never ran one down or had a problem.
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