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Disable auto app updates; manually update at your convenience
iOS 7 will now update your apps and music in the background. If you're connected to Wi-Fi networks (or the cellular network), your apps will remain up to date without bugging you. But this consumes data and power, and should be restricted for when you're free to plug in your iPhone to charge.
Tap the Settings icon, scroll down to iTunes & App Store and turn off the Updates and Apps settings. Another quick power (and data) saving tip: You can allow updates when you're on Wi-Fi only by deselecting Use Cellular Data at the same time.
Block persistent callers from contacting you
Calls significantly drain your battery meter, even if you don't pick up incoming calls. If you get the same persistent person calling, you can now block them from reaching you.
To do this, head back to Settings and scroll down to Phone. Scroll down further to Blocked and select the contacts you wish to automatically refuse access. While this feature blocks the call coming through, it doesn't prevent the caller from leaving you a voicemail.
Prevent your iPhone from 'learning' your frequent locations
Your iOS 7-powered iPhone from the get-go records where you go so it can pick out nuggets of information that may help you, particularly if you visit those places regularly. It updates the Today section in your notification center, and can give you estimated times of arrival to your destinations. While it's a handy feature, it is far from absolutely necessary, and can be turned off to save some valuable battery.
Buried deep down in the device's settings, you have to navigate to Settings > Privacy > Location Services > System Services, then switch off the Frequent Locations option. You can also delete any data already collected by tapping Clear History at the bottom of the screen.