Wireless charging is the ability to charge your device without plugging any wires or cables into its ports. Instead, you can use a wireless charging pad to transfer power through electromagnetic induction. The technology that enables us to do it is called Qi charging. The same physics is also involved in reverse charging.

How Does Reverse Wireless Charging Work

The phone with reverse wireless charging has a coil that carries AC current. This current generates a magnetic field around the same. The device that you want to charge wirelessly also has a similar coil.

Therefore, when you bring the two coils in contact, the magnetic field from the coils in the wireless charger (phone with reverse wireless charging) will induce an electric current in the device’s coil that wants to charge wirelessly – this coil is connected to a battery to which the current flows and hence, is recharged.

iQOO9 Pro supports up to 50W wireless charging and The phone also supports wireless reverse charging: hold another device close to the back of the phone and start reverse charging (up to 10W).

Note:

Pictures are from internet source and Data too i.e: GOOGLE

That's All for the day regarding Reverse Wireless charging feature and its Working and any doubts regarding let me know in comment section

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@Naveen Yerradla