3. Clean the multitasking tray.
After exiting an app, it doesn’t properly close. Unlike Windows, where there is a handy ‘x’ to click to close down a program, Apple offers no such option. In actual fact, having multiple apps open in the background doesn’t affect the iPhone battery life too much. The device is designed to keep them open without draining performance levels. That said, clearing them once in awhile can save your phone those all important last drops of juice.