[77newell]

Batteries have an internal natural discharge rate. If you leave any battery isolated long enough it will discharge to the point of losing the ability to recharge to the rated capacity. It takes a rather long time for a new battery to do this but as batteries age this time tends to shorten. You could choose to connect the batteries once a week or every two weeks for a day, but that is a bother when the energy savings are so small I doubt you could find them on your electric bill.

everything I know just ain't so