Reference
Reducing Battery Consumption
Using your tablet device as described below will reduce battery consumption.
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Reduce the screen brightness (Tap [
Apps & Widgets] - [
Settings] - [Display] - [Brightness]).
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Disconnect the USB devices.
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Set a short period of inactivity for turning off the screen (sleep mode) automatically (Tap [
Apps & Widgets] - [
Settings] - [Display] - [Sleep]).
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Press the power button lightly to turn the screen off (sleep mode) when you will not be using your tablet device.
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Shut down your tablet device when you do not use it for a long time [Details].
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Turn off each feature when you do not use Wi-Fi, Bluetooth, or GPS.
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