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Reduce screen timeout
Android phones will automatically dim and then turn off the display after a set interval. It's worth setting this interval as short as possible which will have a good impact on battery life.
Some Samsung Galaxy phones, like my Note 2, have another setting called Smart stay. This prevents the screen from dimming and timing out if it detects the user is looking at the screen. This is a great utility and makes it possible to set the timeout interval shown above to as short as possible. The screen won't keep turning off while you're using the phone, but will do so if you're not using it after a few seconds.