Xtar has recently upgraded their 16340 battery from a 600mAh to a 650mAh capacity. The lithium-ion cell is ideally meant for use with high-end LED flashlights and other portable electronics, including electronic cigarettes and laser pointers. A built-in over-charge and over-discharge protection is included, which makes it both safe and reliable. This 16340 button top battery gives users an affordable and long-lasting alternative to primary CR123A cells.