Sony SR621SW 364 Battery - 1.55v Silver Oxide - Battery Store
Voltage: 1.55 Volts
Capacity: 23mAh
Chemistry: Silver Oxide
Dimensions: Diameter 0.27"(6.8mm) x Height 0.08"(2mm)
Weight: 0.01 oz (0.31 g)
Termination: Button Top (Button Top - Pressure Terminals)