I just started using a 14500 rechargeable with my zebralight sc52 (Wanting the extra power and brightness). The batteries are ultrafire, I have checked the volts and they are at 4.12 after charging. I am wondering what my expectations should be as far as how long the batteries should last when in use? I get less than an hour total with the light left on and the brightest setting lasts only about 3 minutes. My alkaline batteries perform much better??? is this normal??? If I should try another battery for better results which one is the best as far as performance/longevity? Are the zebralight batteries quality??