Samsung GALAXY S8 User Manual page 18

You can also choose to display a percentage value.
Viewing a percentage value can provide a better idea
of the remaining charge on the battery. For more
information, see "Battery" on page 209.
While charging, the device and the charger may
become hot when using wireless charging or fast
charging. This does not affect the device's lifespan or
performance and is in the device's normal range of
operation.
The charger may stop charging if the battery becomes
too hot.
Set Up Your Device
If the device heats up while charging the battery:
1. Disconnect the charger from the device and close
any running apps.
2. Wait for the device to cool down, and then begin
charging the device again.
If the lower part of the device overheats,
•
check for damage to the connected USB cable.
Replace the damaged USB cable with a new
Samsung-approved cable.
If using a wireless charger, do not place foreign
materials between the device and the wireless charger.
Micro-USB Connector
You can use the included Micro-USB connector to
connect a Micro-USB cable (such as from your old
device) to your new device for charging with the
charging head, or for connecting to a computer.
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