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See what's going where
Knowledge is power, so the first thing to do is to see what's sucking at your battery the hardest.
To do this go to Settings > Battery to get a breakdown. From here you'll be presented with a list of features and applications that are draining your battery the hardest, and if you see a feature or service sucking up a lot of power, you can shut it off.
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.