Four Ways to Make Your Battery Last Longer

 Screen Brightness is the single biggest battery energy eater and reducing it will save your battery.
   

1. Push e-mail – depending on the number of e-mail accounts one has, your cell phone could be draining your battery as it updates every fifteen minutes. Turn off your “Push” feature and set it to Manual. 
2.  GPS Checks – some Apps require knowing where you are and all that checking drains your battery. Check your phone to see which ones you need and turn the rest of them off.
3. Notifications – apps sometimes display pop-up notifications (the blue bubble that looks like a text) turn them off. 
4. Background Apps – those apps that you have opened but have not closed drain your battery. Make it a good habit to close after use.

Source:  http://pogue.blogs.nytimes.com/2011/05/23/four-ways-to-make-your-battery-last-longer/