Our battery card is made with a scuba webbing core to give the maximum in rigidity and is cordura wrapped to match the rest of your kit. These cards are backed with hook velcro to allow mounting to any loop velcro surface. Paracord loop for easy removal and storage. You can store upto 5 cells ranging in size from AAA to 18650 with AAA having the least retention and 18650/18350 having the most.