Geoduck
(Geoduck)
22
If these lights are just for a small survival kit, I would recommend a fenix EO-1 with a lithium battery. I know it doesn’t really meet your criteria but they really are bomb proof and have nice runtime. I put them in the small survival kits I made with a extra lithium battery and they take very little room. For a primary or even a back up light I would definitely go with something bigger at least AA size.