Recharge Your Batteries… with Your Phone (HUAWEI P40 Pro)
No charger? No problem. Your phone can serve as a portable wireless charger for any device that supports wireless charging, including phones, headsets, and watches.
Start charging
1. Open Settings, touch Battery, and enable Wireless reverse charging.
2. Make sure that the device to be charged is turned on, and place it squarely in the middle and on the rear of the phone body. When reverse charging is initiated, the device will enter charging mode.
Note
Reverse charging automatically stops when the battery level on your phone drops below 20%.