Battery life is mostly affected by: signal strength, radio usage and screen brightness. If you are in a area with low signal strength your battery will have a lower battery life. Using your device for long periods of time for calling or internet will result in a lower battery life. Having the screen birghtness at maximum and the screen time at more than one minute will reduce your battery life. Another setting that affects battery life are the location services. Go to Settings/Security and location/Location and change the settings there, turning off location services will maximize your battery life.