Well here is what I have learned with all the great help this site offers. First, "don't leave your unit plugged in for weeks at a time without using the battery disconnect" I pulled the battery's out and found them to be completely DRY. I also found that these battery's are VERY expensive. Well over $300 for two new ones. I decided to fill them with distilled water and put them on my auto charger. Being 6 volt, I connected them, then placed them on charger. It wasn't a week ago that I used the battery's so I hoped that I hadn't fried them. This morning one seems to be pretty good via the volt meter, the other just under what I was hoping for. So I am going to reinstall and let charge for 24 hours in the unit then recheck. I betcha I'll remember to utilize the disconnect in the future now. Never had this happen with my old unit but it was a Class C with one 12 volt battery. It would go bad about every three years. live and learn, thanks gang