Apple Watch (44 mm Series 4) Battery

Replace a dead or damaged battery in a 44 mm Series 4 Apple Watch.

For optimal performance, calibrate your newly installed battery: Charge it to 100% and keep charging it for at least 2 more hours. Then use your device until it shuts off due to low battery. Finally, charge it uninterrupted to 100%.

Learn more about safe lithium-ion battery handling and proper disposal.