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MOST IMPORTANT

1) Do not use "no lock" app, because will prevent your phone to enter in the deepest sleep state.

2) Turn Off Weather App
This is a function that downloads data very frequently, which can be translated in battery drain. Turn this function off by doing the following: Menu, then All Programs, followed by Weather. Choose the Menu option from within the Weather program and choose Settings where you can disable Update Automatically. Now you can refresgl Weather information whenever you want it.

3) Constantly updating applications
Set your other constantly updating applications to lower update frequencies  intervals. There's really no menu to navigate here,but it depends on the applications you're using. For example you could set the Facebook/Twiter app to only update once an hour or two rather than every 5 minutes.

4) Remove big/complicated widgets from the home pages

Some widgets do a lot of work when you scroll to the page that contains it. For example, downloads data, compute data. This require high CPU usage, radio and so on. Use only simple widgets.

5) Install Power Schedule to automatize flight mode - brightness level

More details here: http://androidtech.net/reviews/app-reviews/87-save-battery-life-power-scheduler