My battery was running down as well, new battery . I would put the maintainer on and would take all day to charge up to full and after checking every couple hours I disconnected the battery, fully charged it and checked the volts every few hours and it kept dropping. I had ordered the battery online, emailed them and told them it doesn't hold a charge. It went from 13.6 volts fully charged down to 12.3 over a day. No questions asked battery is on the way , My ST1300 , if I put on the maintainer is fully charged in a few hours. And thats sitting for a week or 2. My tractor, I checked the volts on that and hasn't moved down in 2 weeks. Might just be the battery, my 2 cents.