wouldn't have mentioned it on here otherwise, but yesterday i was charging the batteries in Leveller (24v lead acid) with a new charger. I left it going in the shed and went in for a few hours expecting it to cut out when it was done. I came back later to find one of the batteries had blown off it's cover and 4 of the little rubber caps (over the holes for topping up the water) and the water was bubbling and coming over the top with a nice little puddle over lev and the floor. The charger still convinced it wasn't fully charged...

Any ideas what the hell happened?? :s