Originally Posted by balto charlie

Hey J: I posted earlier that I had no problems w/ my Fenix, the cold and NiMH batteries. Well all of that has changed recently. A few weeks back I rode for a few hours in cool temps(40F, 5C) with the light on flash mode. When it came time to switch to high it died. I figured batteries. I returned home charged all of my batteries for the AM commute. Temps dropped to 13F/-10C. That morning the light worked for less than an hour. I recharged them again then I realized that the overall brightness was no longer there, lost all modes other than high(but not as high as before) and flash. All lower levels gone!!! I know my batteries are good as they light other lights well. Run time is much shorter and brightness reduced. I never bang my light around. I am contacting Fenix to tell them the problem. Perhaps these light are a "1 year only light". FWIW: I ride almost everyday, run the light 1-2 hours per day; so this might just be it life expectancy. Charlie