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As SD said. Ask any battery manufacturer, and they will tell you the same thing. After 30 days without a charge, precipitation forms in wet cells and some of it is insoluble and will NOT go back into solution no matter what anyone promises. From that point on, the longer they sit the more permanent damage occurs and after two years sitting? You might as well throw them out and save yourself the time and aggravation of playing with them. *IF* you manage to put any charge back in them, the odds are that one $75 deep cycle battery from WalMart will have more power than all of whatever you have left.
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