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Don't use moving 'dynamic' wallpapers
iOS 7 now comes with dynamic wallpapers that adjust based on your hand movements, such as bubbles that float around the screen depending on which way you hold your iPhone. These moving backgrounds consume far more battery power than regular static wallpapers.
To select a "still" wallpaper, go to Settings > Wallpapers & Brightness and scroll down, then tap your existing wallpaper under Choose Wallpaper. Either select a background from the Stills category, or a static photo of your own choosing.
Watch video, listen to music sparingly
Watching video and listening to music can churn up a great deal of battery life, not least because your display will be on for the duration when watching video. Use sparingly and only when you have to. If you're on a long airplane or train journey, listening to music is better as it doesn't light up the display. Or, read a book!
Forget downloading, streaming on the go
With iOS 7, you can stream music and video that you have already purchased, or is in your iCloud. However, not only does this take up a lot of data (even over Wi-Fi connections), downloading content or streaming on the go will churn up vast amounts of battery life. Plugging in the device and downloading content through iTunes is significantly lighter on the battery life. Or, if you are wanting to stream or download on the go, use Wi-Fi as it uses less power than cellular data.