When a battery sits for a long time not charged the lead on the plates hardens and will not accept a charge well after that. The chemical reaction between the acid and the lead is what generates the electricity and the lead must be able to go back into suspension in the acid to do its magic. More batteries are killed because of this neglect. Car batteries are charged every time you drive so its not a problem with them.
I think more batteries are damaged while at the dealer awaiting warranty service than any other reason. New battery is allowed to deplete and then is damaged and we pick up our rigs and wonder why the battery won't last as long as it used to. I took my rig in for warranty work once and after a week I called and told them to put it on a charger, yeah, right, I showed up to check on them and their eyes got a little bit big because I caught them blowing smoke up my backside. I took the battery home to keep it charged and told them I will bring it back with me when I pick it up. They can plug it in if they needed power. That was funny. They did not know how to react.
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