I would make some design suggestions, such as a screw-on cap with a lanyard loop (both for ease of carry and to make the cap easier to keep track of), but it works. I'll test it in my Lightiny V2 as soon as I can to see how long it'll run, but when I tested it compared to 3xAAA, the light was just as bright. Much less wasteful and a handy alternative to having to buy a bunch of batteries for multiple shows!