I have a C8 mounted on my AR15 that I use for coyote hunts. It has held up really well so far. Now I only put it on there when I am on the coyote’s, it’s not something I keep on there for around the house and other life and death type needs. I agree with Bwalkers recommendations if you are using them for self defense and bump in the night type situations. I have a few of the Nitecore P05 that I use on a AR and the lower pic rail of a pistol for the house guns. They work really well, fairly inexpensive. $55 I think. All of the ones mentioned so far take rechargeable LiIon batteries.