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This battery is mercury free and has a capacity of 29 mAh. Suitable for analog and basic digital watches and hand held devices that have a continuous, low power consumption. Renata Button battery cells are at top of the world with a reported failure rate of less than 1%. Manufacturing high quality batteries with high capacity retention on storage. Renata continues to provide reliable power sources for many hand held devices. Chemistry: Silver Oxide Voltage: 1.55V Battery size: 373 Capacity: 29 mAh Diameter: .37" 9.5 mm Height: .06" 1.65 mm SWISS MADE