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"...
When I was using four 6-volt golf cart batteries I would check them every 4 months and add distilled water as needed. One gallon of water would last me two years. You not only need new batteries, but you need a new converter that won't cook your batteries to death.