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Turn off auto-brightness; adjust manually
Some believe that the iPhone's "auto-brightness" feature will help conserve battery life by dynamically and automatically increasing or reducing the brightness of the screen, based on how light it is around you. Yet, others argue that this alone can actually lead to the battery draining. It may not be easy to read your iPhone's screen in direct sunlight, and you may not get the most out of your high-resolution display, but this is about conserving your battery rather than anything else.
The best practice seems to point to disabling the auto-brightness. Go to Settings > Wallpapers & Brightness, then reduce the brightness to 10-25 percent, or whatever feels comfortable.
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!