I would like to piggy back on this same question. I ask in regard to my new ultra stinger. Personally I am letting the battery run down to the first sign of lost brightness and then charging it for the full 10 hours but not letting it sit on the charger after that. From what I have researched this is the way to best care for the battery. Is this what should be done? How are others out there caring for their rechargeable batteries.