CR123A Lithium primary cells are the international standard for powering tactical lighting products. CR123A spiral wound Lithium batteries have the advantage of high energy density compared to more traditional battery chemistries (such as alkaline). 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 leak proof and vibration resistant. They provide the most dependable source of power currently available for handheld professional lights.
When used in devices that have a high rate of discharge (such as high intensity flashlights), internal cell heat can build up and result in explosive conditions. A PTC (Positive Thermal Coefficient) circuit and backup pressure relief vent allow safe operation of CR123A Lithium batteries in high discharge devices, including ASP high intensity LED flashlights. If an ASP battery short circuits or discharges at currents above their design limit, the PTC causes the cells internal resistance to increase, limiting the amount of current that can be drawn and keeping the internal cell temperature within safe limits. The pressure relief vent activates to relieve excessive internal pressure. These internal safety devices increase battery cost.
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About 2 inch's in lenght