Hello, I've got an issue with my two 85amp chassis batteries in my Damon Daybreak 95'. I left them to charge with the RV battery charger for 24hrs and both of them them seemed ok, went up to 13.25v. Next time I left them on for 48hrs to see how this will effect them and they got flat, down to 11.4v. Is there something I'm missing? It is still the original 95 charger so maybe it's faulty? Or perhaps something else is draining the chassis batteries that I'm not aware of? I don't drive my RV at all right now, not till I get the licence so I'm also searching for a way to keep the batteries in good working condition.