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Turn off AirDrop except when needed
AirDrop is now available for iPhone 5, 5s, and 5c devices running iOS 7, allowing you to share files and photos with friends and colleagues over the air when they are in close proximity. But its use can take a heavy toll on your battery, particularly when AirDrop is in "discoverable" mode.
Simply swipe up from your home screen to bring up the Control Center, then tap AirDrop. Select Off when you're not using it.
Limit apps from churning up data, power in the background
You can now limit which dormant apps download data, and therefore consume power, in the background. For instance, while it may be useful for a mapping app to provide you with up-to-the-minute turn-by-turn directions on the road, you may not want other apps, such as the Stocks app, to update if you're not particularly interested in the financial market.
To change this setting, tap through to Settings > General > Background App Refresh, then deselect apps that you do not want to update in the background when they're not in use.
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.