Samsung Galaxy S9 User Manual page 15

Basics
Charging other devices
Use the USB connector (USB Type-C) to charge another mobile device with your device's
battery.
Plug the USB connector (USB Type-C) into your device's multipurpose jack, and connect your
device and the other device via the other device's USB cable.
When charging starts, the battery charging icon will appear on the other device's screen.
USB Connector
(USB Type-C)
The other device's
USB cable
The app selection pop-up window that appears on your device is for data transfer. Do
not select an app from the pop-up window.
Your device
15
The other
device