Reverse Charging - definition

Reverse charging is the process of charging a mobile device from another mobile device or smartphone via a USB cable or other ways. Just like your regular power bank. It can transfer or share power with other mobile phones in time of emergency.
Several ratings of reverse charging can be found based on the device manufacturer, but they never adequately reveal that information. The power transfer speed in the reverse charging method is not that surprising, can be around 10W or more. Also, another thing is a device that supports Qi Wireless charging doesn't need to be get connected via cable, they can share power wirelessly as well.