In the OnePlus phone Settings menu, tap Battery. Click the \"Reverse Wireless Charging\" option. Turn on the switch on the right of [Reverse Wireless charging]. So you can charge your own phone with another OnePlus phone.
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The principle of wireless charging technology is actually relatively simple, the use of electromagnetic induction principle, learned high school physics we should all understand that electromagnetic waves have energy, through the electromagnetic coil can capture this energy, and then form a current in the coil, and finally through a series of circuit integration can achieve charging.