Saving the Battery Consumption
Using your tablet device as described below will save the battery consumption.
Reduce the screen brightness (Tap [ Apps] - [ Settings] - [ Screen] - [Brightness]).
Disconnect the USB devices.
Set a short time-out period for turning off the screen automatically (Tap [ Apps] - [ Settings] - [
Screen] - [Timeout]).
Press the power button lightly to turn off the screen when you do not use your tablet device.
Shut down your tablet device when you do not use it for a long time [Details] .
Turn off each feature when you do not use WI-Fi, Bluetooth, GPS, or Wireless WAN.