Samsung GALAXY S4 User Manual page 18

Charging the Battery
Your device comes with a Wall/USB Charger (charging head
and USB cable) to charge your device from any 110/220 VAC
outlet.
Note: The battery comes partially charged. You must fully
charge the battery before using your device for the first
time. A fully discharged battery requires up to 4 hours of
charge time. After the first charge, you can use the
device while charging.
1. Insert the USB cable into the port.
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DRAFT - Internal Use Only
2. Connect the USB cable to the charging head, then plug
the charging head into a standard AC power outlet.
3. When charging is complete, unplug the charging head
from the power outlet and remove the USB cable from
the device.