Surefire Battery, LFP123 Rechargeable, 2/Pack, White SFLFP123 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.