This UltraLife Long-Life 9V Lithium Battery has a high energy density of up to 5x more than alkaline batteries and up to 10x more than carbon zinc batteries. It has a shelf life of up to 10 years, a high running voltage, a flat discharge voltage curve, low impedance which enables better performance at low temperatures, and advanced safety features like over current protection. This battery meets ANSI Alkaline 1604 size specifications and has a low short circuit temperature.