Samsung Galaxy Watch4 (40mm) and Watch4 Classic (42mm) Battery

Replace a dead or malfunctioning battery in a 40mm Samsung Galaxy Watch4 or a 42mm Galaxy Watch4 Classic.

This is an aftermarket part. It is not a genuine Samsung part.

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%.