Diamondback Tactical makes a slick little battery holder that solves a problem for me. I have had a CR123 battery become dented and unusable while knocking around loose in a pocket of my backpack. I have also read accounts of how CR123 batteries can heat up and vent when loose items in a pocket are able to short the battery. The Diamondback Tactical 123A Battery Holder (MOLLE) solves these problems by providing a dedicated holder specifically for CR123 batteries that keeps them protected, separate from other small items, and easily accessible.
The pouch is simple. It is two elastic loops covered by an upper and lower flap. There are two snaps that allow the holder to attach to a single column of MOLLE webbing. It has a very small footprint so you can find room for one on any chest rig, belt rig, or back pack. The snaps allow these to be attached and detached from MOLLE webbing in just seconds.
These battery holders are a great way to keep batteries around on your training gear. You never know when you will need a fresh set of batteries to keep you on the line in a low light course. I also use them on my hiking packs so I can keep spare batteries around for my headlamp or flashlight. They are simple and effective.