Swatch Watch Battery Sizes at Lelia Teal blog How to Replace a Watch Battery: An Easy Guide RS Chrono Watch Battery Size Chart Uk at Piper Walton blog SR621SW Watch Batteries 2 x Seizaiken 364 Equivalent Cell Button. GENERAL SPECIFICATIONSProduct: Watch Battery Only Battery Cell Composition: Silver Oxide Recommended Uses for Product: Watch Battery Count: 1 Cell Model Compatibility: Fit NW 1211GYGY Operating Temperature Range: 40 Degrees Celsius to +85 Degrees Celsius Shelf Life: 5 years Leakage Resistance: Anti Leak Design Movement Compatibility: Quartz 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: NW 1211GYGY_K0060774