Posted 2/4/2019 20:06 (#7297230 - in reply to #7290105) Subject: RE: Any experience with 18650 batteries?
Here is an interesting fact that I'm sure you didn't know.
Instead of using one 18650, you can instead use (2) CR123's in its place. CR123 are a great backup option because that have a great shelf life and can be purchased pretty much anywhere, however, they cannot be recharged.
The number 18650 is actually the size of the battery, 18 mm wide by 65 mm long
Pretty much every new flashlight I have bought in the last 3 years, with the exception of my LED converted Mag-light, uses an 18650. I have 2 different Fenix headlights, one is the same as the 2nd poster, 1 Fenix flashlight, 1 Olight Flashlight and a couple lesser known brands. They are great batteries that have a very high output with a long run-time. Not all batteries are the same though. They come in a wide range of MAH, most common are 2400 MAH, but I have some that are 3600 MAH. You may be able to get as high as 4200 MAH now. The higher the number, typically the higher the output and longer runtime (on a flashlight anyways).