Keep all of your devices running smoothly with EN22 Industrial 9v Batteries from Energizer. Energizer Industrial Alkaline batteries are perfect for use on heavy current or continuous applications. These batteries have the same specifications as Energizer Long Life Alkaline batteries yet these industrial-strength batteries offer the longest lasting power source of all primary batteries over the range of sizes including AA, AAA, C, D, and 9V. These batteries do not contain mercury and special disposal is not required for these batteries. These 9V cells work effectively in a performance like Wireless microphones, in-ear monitors, handheld devices, smoke alarms, infusion pumps, radios, portable transmitters, security backup systems and more.