The 16340 Lithium battery is a rechargeable lithium-ion cell, often used in compact electronic devices such as flashlights, lasers, and some security equipment. Named for its dimensions (16mm diameter, 34mm length), the 16340 is similar in size to the non-rechargeable CR123A battery but offers the advantage of rechargeability and higher voltage, typically 3.7V. In cybersecurity and physical security, these batteries power wireless sensors, cameras, and other portable devices, ensuring reliable operation and reducing the need for frequent replacements. Proper battery management is crucial for maintaining the uptime and security of such systems.