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First set the brightness as low as possible.
Next thing: Don't have Bluetooth on always.
Next go to Settings and to Display and choose Standard.
In Display also set Screen Timeout to 2 minutes or lower.
Be sure not to have Mobile Data/3G on. It sucks power and money.
There are many apps on Google Play that can help you.
I use the app called Batery Doctor.
You press a button and it finds out how you can save battery.
It shows how long you have back.
Press Save Now and it saves battery.