I have been running my light on Trustfire 10440 cells charged on a Nitecore charger and it runs awesome, just can be a pain in the butt to get the +/- to line up when closing the battery chamber. I have a Maratac copper I bought through countycomm.com and I dare say the output is WAY better, a tighter throw and no having to crank the head 3 times to get to high mode. I would recommend it to anyone.