Now Introducing: Ship In Watch Battery Service The Jewelry Center Replacement Battery for CASIO B640WC 5AVT Watch Walmart.com How To Change Your Watch Battery Yourself The DIY Life How to Change Watch Battery: 8 Steps Ashley Tee. GENERAL SPECIFICATIONSProduct: Watch Battery Only Battery Cell Composition: Silver Oxide Recommended Uses for Product: Watch Battery Count: 1 Cell Model Compatibility: Fit 15640_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: 15640_1_K0051433