Recently we told you how to conserve tablet battery life by modifying the background behavior of mobile apps. Well, the new Background App Refresh in iOS 7 is useful, but it also might drain your battery a little faster. The feature allows apps to refresh their content in the background via a Wi-Fi or cellular connection. Although most iPhone and iPad users will welcome this upgrade, battery misers might prefer to disable it by going to Settings/General/Background App Refresh and flipping the main switch to Off. Alternatively, you can turn off Background App Refresh for apps you use infrequently.