16340 Battery +

The 16340 battery (or RCR123A) is a cylindrical li-ion cell classified by its 34mm x 16mm dimensions, and is the rechargeable version of a CR123A battery. They usually have a 3.6V or 3.7V voltage, button-top terminal, and most use a LiCoO2 (lithium carbon-oxide) chemistry. While some come with built-in USB charging ports, all 16340 batteries are rechargeable in li-ion smart chargers. 16340 cells are often used in flashlights or other small compact electronics.