SR621SW Watch Batteries 2 x Seizaiken 364 Equivalent Cell Button Amazon.co.uk: watch battery Watch Battery Cross Reference Look Up Any Watch Battery Watch Battery Size Conversion Chart at Joseph McClean blog Watch Batteries Batteries Direct. GENERAL SPECIFICATIONSProduct: Watch Battery Only Battery Cell Composition: Silver Oxide Recommended Uses for Product: Watch Battery Count: 1 Cell Model Compatibility: Fit 1589 Operating Temperature Range: 40 Degrees Celsius to +85 Degrees Celsius Shelf Life: 5 years Leakage Resistance: Anti Leak Design Movement Compatibility: Quartz Swiss 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: 1589_K0066427