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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.