Chances are, you could benefit from increased battery life on one or more of your iOS 7 devices. If so, then you may want to take a look at BattSaver for iOS 7, which is the iOS 7-compatible version of BattSaver
by iOS developer Xvolks.
With this application installed, you will get several new settings that you can configure to conserve battery power when you don't need to be using it.
You will find a new application on your Home Screen. When you open it, you'll see the interface above on the left, and you'll see cells for graphs, battery state, settings, battery saving strategies,