45mAh Smartwatch Battery For Fitbit Alta HR,Alta Activity , Part Number Original 3.87V 470Mah Bw40 Battery For Xiaomi Color2 Watch S1 Lot Large Assortment Of Watch Batteries Reliable Watch Battery BU4052 Amazon.com: Vvuilsty A2277 Replacement Battery for Watch Series 5 Gen. GENERAL SPECIFICATIONSProduct: Watch Battery Only Battery Cell Composition: Silver Oxide Recommended Uses for Product: Watch Battery Count: 1 Cell Model Compatibility: Fit BU4052 Operating Temperature Range: 40 Degrees Celsius to +85 Degrees Celsius Shelf Life: 5 years Leakage Resistance: Anti Leak Design Movement Compatibility: Quartz Swiss or Chinese or Japanese Movement Water Resistance Compatibility: Suitable for 50m Water Resistant Watches Mercury Free: Environmentally Friendly (0% Hg) High Low Temperature Tolerance: Extended Performance in Extreme Climates SKU: BU4052_K0070683