Something not rite, just checked the battery charger. Yesterday when we got home the charger said 51% battery life remaining 15 hrs later only 73% charged on rapid charge. I have the caps off and the water is fine the conections are clean and tight. The smart charger will even tell if it has a bad cell, no light. I've got to dig around in my shed to find my old hydrometer, hadn't seen that thing in 3 yrs sense the purchase of the new charger and battery. I'm probably have to bring it in and have a load tester check it. Cant be without a hot battery.