I always leave my trailer plugged in and I am thinking that may not be a good idea! We went on a dry camp last year, and batteries ran low in one evening...have a gennie, but don;t run it all day. My 2 batteries are stock when I bought it....pulled the caps off the batteries, and 8 of the 12 cells needed water badly..(I am of the age that "no water" batteries came into vogue, and never think of them)....I am sure I screwed up on about 5 different fronts here...keeping it plugged in, not checking my water levels, leaving them in over the winter....I will have to go SAMS and get new ones....just need some "slap upside the head" advice on keeping the new ones in good shape! Thanks!!