Help please. Recently on French Aire, battery failed. First time in a year without hook up, so surprised that it failed after just 3 hours. Went to campsite with mains, discovered that fridge (Dometic) no longer working. Back at home, dealer says no problem with fridge, and charged battery- apparently no problem there either, he says. Question - does fridge need a functioning battery to work even if hooked up? And why would battery go flat after 3 hours unless I have a charging problem, which the dealer also denies? Any clues gratefully received!