Lithium primary (single-use) cells are the international standard for powering tactical lighting products, and they are equally outstanding for portable electronics and other consumer products. They have a ten year shelf life, function in a wide range of temperatures and environments, are leakproof and vibration-resistant. ASP lithium cells incorporate a positive temperature coefficient (PTC) protection circuit and safety vent, to prevent instability due to overheating or short circuit. Lithium cells can be used as direct replacements for any batteries with the same designation and voltage (i.e., a 1.5V AA lithium battery can be used in place of a 1.5V AA alkaline cell, etc.)