I agree with DOn. If the case is buldging, it's time to replace it (them). Overcharging, causing excessive heat, leads to the plates shedding their lead paste. That and sulfation will cause those buldges. As for equalization, that only applies to flooded cell batteries, not AGM's. Equalization is a form of controlled overcharging which will help restore a battery and remove sulfation if it is not too extreme.