ASP CR123A Lithium Batteries were created to be the international standard for powering tactical lighting products. Lithium batteries provides an extremely dense energy source, have a ten year shelf life and function in a wide range of temperatures and environments. In addition lithium power cells are leakproof and vibration resistant, providing 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 instability in the event a cell overheats or should rapidly discharge as a result of a short. A PTC circuit and backup pressure relief vent allow safe operation of CR123A Lithium batteries in high discharge devices such as high intensity LED flashlights. Link cases allow an officer to carry a variety of battery types or interconnect any quantity of a battery.