>>1390051Hey Knifu-chan.
Some AA lights can use 14500s as well, BUT most can't, make sure the light you have is rated for both. Alkaline is 1.5v, LiIon is 3.7v (but can be up to 4.2v). Most lights that run on both have separate performance specs for both kinds of batteries.
However, I don't think you will be able to find a legit 2600mah battery. Typically they are less than 1000mah, apparently I see Fenix offers a 1600mah with a built in charge port, but I'm kind of extremely skeptical.
What you may have found is a, what I assume is a, non rechargeable Lithium AA, so it's single use, and going to be a lot more expensive to work with in the long run.
Honestly I think 18560s and larger are ideal for /out. They have tremendous battery capacity over 14500 (I run 3500mah protected cells in all my lights). So at like 15lm (a comfortable amount for one person to hike with), that's like 150 hours of run time, and even at like 60lm (enough for two or three people side by side) you can expect 35ish hours. And having the ability to burst around 1,000lm for an hour or two (depends on the light's thermals), is a big advantage over 14500.
And as for charging, you can get lights with a built in charger, so you can carry a few 18650s if you are /out for a long stretch, and charge them when you get to a town, or just charge it off a solar panel or battery pack.
