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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.