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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.
Get an extra battery
The surest way to get through a busy day with a live phone is to get a spare battery if your phone has a replaceable battery. Keep it charged and throw it in your bag or briefcase when heading out for the day. Having two batteries will certainly get you through the longest day and maybe two days without charging.
A similar action is to get a case with a battery inside if that is an option for your phone. These increase the bulk and weight of the phone but can often double the battery life.