Samsung GALAXY tab4 User Manual page 12

Battery Indicator
The Battery icon in the Status Bar shows the battery
power level. When battery power is 15% or less, your device
prompts you to charge the battery. If you continue to operate
the device without charging, the device powers off. For
battery use information, see "About Device" on page 155.
Tip: Touch the Time field to display battery charge status.
Charging the Battery
Your device comes with a Wall/USB Charger (Outlet
Connector, Charging Head, and USB cable) to charge your
device from any standard AC power outlet.
Note: The battery comes partially charged. You must fully
charge the battery before using your device for the first
time.
After the first charge, you can use the device while
charging.
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1. Insert the USB cable into the Charging Head.
2. Insert the USB cable into the device's Charger/
Accessory Port.