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Batteries would be on a shelf - not on the floor. If my basement gets below zero I have much bigger issues than water infiltration... I appreciate all the feedback and will do some more research before I decide which way to go. Leaning towards AGM due to cost and simplicity.

I am looking for a battery, either to build or buy one, that will sit idle for 99.9% of the time but needs to run a 12v backup sump pump that draws 16 amps. I know I can use AGM but hear so many stories where they fail when needed after sitting for years unused or overcharged. Looking for a...