23A

 GP - Gold Peak GP23A Batteries - 23AE 12V Alkaline Battery

Voltage: 12 Volts

Capacity: 33mAh

Chemistry: Alkaline

Dimensions: Diameter 0.41"(10.2mm) x Height 2.17"(55.00mm)

Weight: 0.02 lbs(7.9g)

Termination: Button Top (Consumer Button Top)