The Surefire Rechargeable Battery CR123A 3.2 Volt Lithium Pack of 2 is the perfect solution for customers who prefer to use rechargeable 123A cells when powering SureFire illumination tools, including weapon lights and hands-free lights. These batteries are safe to use, cost-effective, and they retain approximately 80% of their original capacity even after hundreds of charging cycles. Features The batteries are rechargeable and reusable, saving you hundreds over 123A lithium primary batteriesThe batteries are better for the environment because they contain no hazardous heavy metals