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Keep your phone cool
It's not common knowledge but some folks in the know ensure me that letting the phone get too hot can impact the battery life. I'm told the impact on the battery is particularly noticeable at 95 degrees and above so if you live in a hot climate as I do you'd better keep the phone out of the heat.
If it's very hot outside you don't want to be walking in the heat with your phone in hand, as that exposes it directly to the heat. Keep the phone in a bag or a pocket as much as possible to keep the battery from taking a hit.
If you go to a hot place like the beach, don't leave your phone sitting out in the sun as that will surely suck life out of the battery.
Turn down the screen brightness
This is obvious but worth mentioning. The display on Android phones is the biggest drain of battery, so it makes sense to turn it down as low as possible. This can add hours of life to the battery.
Android phones have an auto-brightness setting that automatically adjusts the screen brightness based on ambient room light. This normally works fine but when trying to sqeeze the most up-time on a charge it is worth turning off. Then you set the brightness manually to the lowest setting that is comfortable to still see the screen. It's worth repeating that this can add hours of battery life on a given day.
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.