Originally Posted by
MLarsJ
Li-ion batteries slowly leak away their charge, if they get to zero charge they are very susceptible to damage and complete failure. Charging them up every three months should do the trick.
If I remember right, that's not what happened to me. I didn't let the battery discharge. The battery just lost its ability to hold a charge, and it happened prematurely. But these things happen. Rather than replace the battery, the company replaced the whole light, and with it, I got new mounts, which came in handy. I'm impressed with the quality and service from Cygolite. I also like the fact that they make their stuff here in the US. We have to expect a few defects here and there, and service compensated for that. By the way, welcome to bikeforums.