unfortunately the light broke in mines or the circuits disconnected somehow so I can't use it. the problem is probably because of the heat it generates when you leave it on at the brightest setting.
ROGUESHADOW3I replaced the batteries and it works fine before it broke down, I've bought three of their flashlight and swap the batteries with them and other brands of 18650 batteries as well, and they've all worked ; it's just in one case only one flashlight broke. I'm still using the other flashlights for every chance I get and they've work with the Lumintop and Orbtronic batteries and for over a year.