How long do AGM batteries stay healthy without a charge?
Someone near me is selling a kit they purchased but never installed ( I know the forum's opinion on kits, but I really just want the panels and batteries to add to my system). The bonus to the deal is that they have 12 AGM batteries that come with it, but since I know something (unfortunately not everything) about batteries, I know they were manufactured in May of 2010. If the person who bought them never did anything with them, is there a chance they are still any good at all? They are Deka Solar 8A31DT batteries if that makes a difference. Thanks!