SureFire 123a Lithium Batteries (2 Pack)

Ten years of weapon lights and I've never had one swell or leak in the tube. These little cells sit tight in the carrier even after heavy recoil, and the ten-year shelf life means a spare set in the go-bag is always ready when I need it.

Bought these for my weapon light and they’ve held up through a couple hundred rounds without a flicker. The lithium chemistry keeps the output steady where alkalines would’ve sagged by now. Glad I grabbed the two-pack.

These little cells have crazy density for their size, and my weapon light runs brighter and cleaner than it ever did on alkalines. They're not cheap, but the shelf life and instant power make them worth every penny for gear you actually depend on.