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. It is lightweight, 18% less than alkaline and has a wide operating temperature range. This battery meets ANSI Alkaline 1604 size specifications and has a low short-circuit temperature.