Of course, Xiaomi can reverse charge the Huawei watch because Xiaomi supports reverse charging function.
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Reverse charging: When connecting other devices, switch to the mobile power supply to discharge and charge other electronic devices.
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When the mobile phone with reverse charging function detects that the OTG device supporting data exchange between devices is inserted, the mobile phone outputs voltage to the VBUS on the USB data cable and prompts for reverse charging.
Enter Settings on your phone. Battery, turn on the wireless reverse charging switch, place the watch in the center of the back of the phone, and start charging