Your battery has enough power that you can use it to charge other compatible wireless devices, like headphones or other phones. Make sure the device you want to charge supports wireless charging.
Open quick settings, then touch & hold 
Or, go to Settings > Battery > Power sharing.
Turn Use Power sharing on 
Power sharing may not work if your battery is low or Battery saver mode is enabled.
NFC is automatically disabled when using Power sharing.
For the best results when charging another phone, remove the phone case, then position the devices like this:

You'll feel a short buzz when the devices connect.