How To Take Your Apple Watch Off Power Reserve. To turn your device back on press and hold the side button until you see the Apple logo and wait for your Apple Watch to restart. You may need to charge it before it can be restarted.

Plug the Apple Watch Magnetic Charging Cable Apple Watch Magnetic Fast Charging USB-C Cable or Apple Watch Magnetic Charging Dock into a USB power adapter. Tap Set as current Watch Face. We start with Apples Web page as seen above.
Here you will see the Power Off and Emergency SOS sliders.
If your battery is low youll see the low battery icon on the screen of your Apple Watch. To get out of Power Reserve follow the instructions on Apple Support page. Tap Set as current Watch Face. Next press and hold the Side button the one below the Digital Crown.
