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Agm sealed lead acid battery cell dry out. hear is why - duration: 5:29. thinking out side box 25,695 views. I have acquired some 12v gel cell batteries, some of which have been left in an almost discharged state for several months, and don't seeem to be charging up readily.. I got a couple of rather large gel-cell batteries the other day (the largest is a 12v 24ah) but it turns out they weren't such a great find. neither will take a charge; with the charger connected, neither battery will.