CR123A (50 Batteries) Max Performance Primary Cells 10 Year Shelf Life PTC Safety Circuit Lithium primary cells are the international standard for powering tactical lighting products. An extremely dense energy source, Lithium batteries have a ten year shelf life. They function in a wide range of temperatures and environments. Lithium power cells are leakproof and vibration resistant. They provide the most dependable source of power currently available for handheld professional lights. ASP Lithium cells incorporate a positive temperature coefficient (PTC) protection circuit and safety vent. The system prevents instabillity in the event a cell overheats or should rapidly discharge as the result of a short. ASP Lithium batteries are packaged in a 4 cell clamshell, 12 cell box or 50 cell carton. A free Link storage case is included in each clamshell and box.table.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; }