Reference
How to Maintain Battery Life
Using your tablet as described below will reduce battery consumption.
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Reduce the screen brightness.
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Set a short period of inactivity before the screen turns off (switches to sleep mode) automatically.
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Turn the screen off (switch to sleep mode) when you will not be using your tablet.
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Shut down your tablet when you do not use it for a long time.
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Turn on airplane mode to turn off the wireless communications or Bluetooth function [Details].
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Disconnect USB compatible devices.
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Turn on the power save mode for the screen [Details].
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