Dim the screen brightness or use auto brightness
Extend the life of your battery dramatically by using auto-brightness — it adjusts the screen’s brightness to ambient lighting levels. For better results turn your screen’s brightness down to the lowest setting.
Keep the screen timeout short
This refers to the time it takes for your smartphone to go to sleep (screen turns off). Every second counts here, so consider reducing that figure to 30 seconds or less.
Turn off Wi-Fi
Turn it off when you go out the door, and turn it back on only when you plan to use a Wi-Fi network.
Don’t leave apps running in the background
Apps running can burn a lot of energy. By killing apps that you aren’t actually using, you can drastically reduce your CPU’s workload and cut down on its power consumption.
Don’t use vibrate
Did you know that vibrating uses much more power than playing a ringtone does? After all, a ringtone only has to make a tiny membrane in your phone’s speaker vibrate enough to produce sound.
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