Originally Posted by
Juha
Halogen lights were easy. I knew I had to recharge batteries every so often. With affordable be-seen LEDs all that changed. I couldn't keep track on how many dozens of hours I had used any particular light with one set of batteries, and whether it had been on blink or constant mode. At that point I started carrying backup batteries. I would check before ride, and change as needed. That doesn't work with Fenix.
For a commuter it's a bit of a dilemma. I would rather have a steady light throughout the burn time, but if the light dies unexpectedly in a middle of a tricky traffic situation it can be a real PITA. It all boils down to the fact that right now I pretty much cannot predict the burn time with the batteries I have. I'll have to fix that.
--J
It really sounds like the fault of your batteries rather than that of the light. I notice a dimming before my light goes out that lasts for at least ten minutes. It sounds like your batteries lose voltage all at once.
Also, my burn time has been very regular, I know that I can get two days of commuting with time to spare on one set of batteries. Try some new batteries and please tell us the results.