Genuine Rechargeable Li ion Battery A2749 For Apple Watch Ultra GPS A2749 Apple Watch Series 8 Ultra (49mm A2749 Apple Watch Series 8 Ultra (49mm Apple Watch Ultra 2 (49 mm), Akkumultor, 564 mAh, Li Ion, Original Apple Watch Ultra 49mm 542mAh A2749 Li ion Battery Replacement PKCELL SR521SW Watch Battery AG0 379 LR521 Battery 1.5V Alkaline Button. GENERAL SPECIFICATIONSProduct: Watch Battery Only Battery Cell Composition: Silver Oxide Recommended Uses for Product: Watch Battery Count: 1 Cell Model Compatibility: Fit AD529APU Operating Temperature Range: 40 Degrees Celsius to +85 Degrees Celsius Shelf Life: 5 years Leakage Resistance: Anti Leak Design Movement Compatibility: Analog Quartz 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: AD529APU_K0068632