Understanding Different Types of Watch Batteries 1 4PCS 3.7V 380mAh LQ S1 Lithium Polymer Battery For Smart Watch HLX S1 Top Brand Smart Watch Battery 3.7v 350mah Rechargeable Li ion Polymer FT Series MT battery. GENERAL SPECIFICATIONSProduct: Watch Battery Only Battery Cell Composition: Silver Oxide Recommended Uses for Product: Watch Battery Count: 1 Cell Model Compatibility: Fit MT LTD 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: MT LTD_K0052555