HTC DROID DNA User Guide - Page 267

Settings and security 267 § Turn GPS on only when a precise location is needed. To prevent some apps from using GPS in the background, keep the GPS satellites (or Standalone GPS Services) setting off. Turn it on only when you need your precise location while using navigation or location-based apps. Go to Settings and tap Location to turn this setting on or off. Manage your display Lowering the brightness, letting the display sleep when not in use, and keeping it simple helps save battery power. § Use automatic brightness (the default), or manually lower the brightness. § Set the screen timeout to a shorter time. § Don't use a live wallpaper for your Home screen. Animation effects are nice to show off to other people but they drain your battery. Changing your wallpaper to a plain, black background can also help a little. The less color is displayed, the less battery is used. § Set the web browser to auto dim the screen while webpages load. Open the Internet app, and then tap > Settings > Accessibility > Dim screen during page loading. For more details, see Changing display settings on page 270 and Personalizing on page 60.