Reference
Saving the Battery Consumption
Using your tablet device as described below will save the battery consumption.
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Reduce the screen brightness (Tap [
Apps] - [
Settings] - [
Screen] - [Brightness]).
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Disconnect the USB devices.
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Set a short time-out period for turning off the screen automatically (Tap [
Apps] - [
Settings] - [
Screen] - [Timeout]).
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Press the power button lightly to turn off the screen when you do not use 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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