Since the release of iOS7 people are complaining about the battery drain problem. iOS7 consumes more battery in Dynamic Wallpapers & Background Application Refresh and Update. Things to do/remember are below.
- Use static wallpaper – Go to Settings -> Wallpapers & Brightness -> Choose Wallpaper and select a static wallpaper
- Turn off Background Application Refresh – Go to Settings ->General-> Background App Refresh and turn it off.
- Turn off Wifi if you are on Mobile data connection, it will further save battery life by not searching for Wifi networks.
- Do not leave an application open if it uses GPS (location services)