The SFLFP123 batteries are the perfect solution for customers who prefer to use rechargeable 123A cells when powering SureFire illumination tools, including WeaponLights and hands-free lights. While they lack the capacity of SureFire 123A lithium primary cells, SFLFP123 cells are safe to use, cost-effective, and they retain approximately 80 percent of their original capacity even after hundreds of charging cycles.