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Disable auto app updates; manually update at your convenience
iOS 7 will now update your apps in the background. As 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.