[RyanN]

We dropped one of our batteries from last year. The little plastic strip on the top of the battery came loose, giving access to the cells. Later, that battery tipped over somewhere, and the acid poured out of it. When this happened, it still has 12V on the posts, but when we tried to move, it would reset the controller. Obviously, if there is a problem with a battery, then its either the posts or one or more of the cells.