Premium batteries require protection from physical and environmental damage, but need to remain accessible to keep advanced tactical lights running at full power. The CellVault-18 takes attachable battery storage to the next level with features like side windows that help you verify gear status, a metal locking latch, and waterproof double-layer construction. Looking for premium storage solutions for CR123 or alkaline batteries? Check out the original CellVault and its big brother, the CellVault XL. Looking for storage for 21700 batteries? Check out the CellVault-21. You can also see the full range of CellVault solutions including the CellVault-5M. Unlock the bottom latch and open the CellVault-18. Fold the latch flat to reduce profile. Insert the rigid strut through MOLLE/PALS Webbing. Unfold the latch to 90 degrees. Verify the foam shock absorber is at the bottom of the CellVault-18 tube. Insert battery(or batteries) with the positive (+) terminal towards the foam at the bottom. Close the tube and latch, making sure no material is caught in the tube/cap interface.