There are some previous posts around the forum on this question--you might want to use the google search function in my sig to look around for them...one of the other mods, CarlD, had that same problem, and ended up changing his battery out a couple of times over 2 or 3 seasons. I personally have one, and it's still working fine on the original battery. I got mine about 4 years ago and have been very, very pleased, although I think mine was one of the original Pool Busters--the HD and CG are updated models of the one I have.