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No haptic feedback
Most Android phones have haptic feedback that gives a little vibration when keys are pressed on the keyboard and at certain other times. Just as vibrating when receiving a call takes a hit on the battery, so does haptic feedback.
If you don't absolutely have to have it, turn off the haptic feedback.
Reboot once in a while
Android smartphones are handheld computers, and just like the bigger computers they can get lots of stuff going over time that hits the battery. It may not always have a positive affect on the battery, but it doesn't hurt to occasionally reboot the phone. It makes sure you start with a clean slate with as few apps running in the background as possible.
Turn off app notifications
Many apps offer notifications, those little messages that tells you when something has happened in the background. Unfortunately, for the apps to know when there is something new they must be polling the network all the time. This can eat up a lot of battery if the polling is happening frequently and there are a lot of apps doing it.
You'll have to go into each app to turn the notifications off but it's worth the effort. Two of the biggest offenders are Twitter and Facebook so turn those app notifications off unless you can't live without them.