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"...
Did you fill the batteries to the bottom ring and not the top? Did you distilled water? Doubtful it matters with the amount of water added, but good to know for the future.
With excess water and a short they are likely compromised. At a bare minimum have they load tested.