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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.
One of the most effective ways of prolonging battery life is to disable the cellular and wi-fi radios, and you can do this easily by putting the device into Aeroplane Mode.
Swipe down from the top-right and tap Aeroplane Mode.