Turn off background app refreshing (iOS 7)Apple's new software iOS 7 comes with features like Background App Refresh. This function looks at the apps you use most often, the time of day that you use them, and then automatically updates them for you so that the next time you open the app, the latest information is waiting for you. Needless to say, this useful feature drains battery. To turn it off:
Settings -> General -> Background App Refresh -> Either disable the feature entirely or for specific apps