I have a few questions about my trolling motor batteries.My trolling motor seemed to be getting a little weak. I checked the fluid levels in my lead acid batteries and found that one of the batteries was completely dry in all but 1 cell. I had just topped off the fluid in that battery in June, so something is definately wrong.My question is, does this sound like an issue with my batteries or my charger? Id hate to drop new batteries in it and have the charger fry those too.I am using a pro mariner 3 bank that I bought brand new last fall. It seems to take a very long time to charge, usually over 24hrs.