Tap Battery saver to turn on Battery Saver. Note: From the home screen, tap the Settings icon > Battery > Battery saver switch.
Adjust the Brightness to the lowest setting and turn on Night brightness. Note: From the home screen, tap the Settings icon > Display > Brightness.
Set the screen timeout to the shortest setting. Note: From the home screen, tap the Settings icon > Display > Screen timeout.
Turn off location and GPS services. Note: From the home screen, tap the Settings icon > Location > Location switch.
Turn off auto-update apps. Note: From the home screen, tap Play Store > Play Store Menu icon > Settings > Auto-update apps.
Turn off Wi-Fi and Bluetooth services when not in use Note: From the home screen, swipe down from the top of the screen to access the Notification Menu > Wi-Fi & Bluetooth.
If you are traveling and do not have access to mobile or Wi-Fi networks, switch to Airplane mode. Note: From the home screen, swipe down from the top of the screen to access the Notification menu > Airplane mode.
Avoid using live wallpapers. Note: From the home screen, tap the Settings icon > Home screen > Wallpaper.
Turn off Auto-sync data. Note: From the home screen, tap the Settings icon > Accounts & sync > Auto-sync data.