100% Tested Original For Apple Watch Series 1 for Series 1 A1578 A1579 Battery A1578 For Appl@ Smart Watch Sport Aluminium A1553 A1802 ( 1st [A1578] OEM Replacement Battery For Watch Series 1 S1 38MM Polar Tech 100 42mm Battery For Apple Watch Series 1 for Series 1 A1579 A1803 1st. GENERAL SPECIFICATIONSProduct: Watch Battery Only Battery Cell Composition: Silver Oxide Recommended Uses for Product: Watch Battery Count: 1 Cell Model Compatibility: Fit 15678_1 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: 15678_1_K0051422