[KMBRTAC45]

I have 4 Surefire lights(2-E2E's, 1-Z3 & 1-G2) and what usually happens is towards the end of the batteries life they will dim slightly about 5 minutes before the light dies. If you are not paying attention it will seem like the light just stops. Lights like Surefire and other high output lights only work if they can draw maximum power from the battery, if you have other items that use a 3v lithium they still have some power in them and can be used in low draw items. I keep at least 2 boxes of batteries around at all times, if I'm going to Michigan for deer season I will grab a couple of extra boxes.