Over Charging Batteries

Has anyone com across this problem

This morning when I turned the caravan lights on I found that I had a battery problem, when I opened the battery box the battery a 100ah glass mat had balloned. I believe this to be an over charging problem. I've been using a powersaver BC-012-15A for about 6 years through a surge arestor without trouble. As I have never received manuals on this bit of kit I don't know whether its a setting that has caused this or the unit is shot.
Any comments welcome
Chris
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