I'm trying to charge my house batteries. They're "Deka Pro Master" GC15's I had to add over a gallon of distilled water to them today and when I tried to charge them I got an "internal shorted cell"...
IMO, whether you have GC-15 or GC-2 6 volt wet batteries, IF you are adding more than about 12-16 OUNCES of distilled water to each battery to top it off at any one time, chances are that at some point, the top of the plates are/were dry and they are cooked. If your battery charger is showing that you have a shorted cell and the batteries won't hold a charge, well, . . . . that's just more bad news. Please don't shoot the messenger.