I had the same problem, when ever I wanted to use my TH I would always have to go pick the batteries up acouple of days before, charge them and then reinstall them. That got old and I got smart, I called the manufacture (Ragen) and told him the problem and he told me there was a plunger switch in the front of the trailer by the batteries located on the frame, well it was drawing power from my batteries causing them to go dead so I pushed the plunger toggle switch thingy and now I'm good!