DURACELL Duracell CopperTop Alkaline 9V Battery, 12 pack MPN: MN1604BKD. Alkaline batteries are used in many household items such as remotes, mouses, clocks, and toys. Duracell Battery include characteristics like: Voltage: 9, Standard Battery Size: 9V, Standard Battery Pack Size: 12. Expiration dates: Aprx 4-5 years out