I really think lots has to do with the battery charger and maintaniance

I had a pocket cruiser with a high end Guest charger and I had a set of Gould batterys that lasted well I will not say you would not believe anyway. If you just charge with a cheap charger I dont think it helps that batts

Mine were in plugged to shore power Mid May thru October than one lead taken off but left in the boat for winter

I am not sure if any last long time with out minimal care
Hank

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