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Reduce screen brightness
One of the biggest draws on the battery will be the device's screen. The brighter the screen, the more power it takes. Therefore, by cutting down on the brightness of the screen you can get more time out of your battery.
Go to Settings > Display > Brightness (or swipe down from the top-right and click on Brightness) and turn down the display to a point where it's just bright enough for you.
While you're there, you can disable auto brightness.
Get sync under control
Your Android device is doing a lot behind your back, checking for new emails, tweets, and so forth. All this takes battery life, and if it's not something that bothers you – maybe you're content with opening the email or Twitter client to check for messages – then you can disable it.
From Settings choose the account you want to check or change the settings of. Disable the syncing of anything that's not important to you.
Location, location, location
The GPS radio is a power-hungry piece of hardware, and if you don't want to know where you are the whole time you can make a change that will save you some battery life.
Tap Settings > Location > Mode and change the mode to Battery saving.