See what’s sucking the most juice
Navigate to Settings > Battery to see an organized breakdown of what’s consuming your phone’s battery. Applications and features will display in a descending list of battery hogs. If you see an application you barely use or a feature you never use, you’ll want to uninstall the app or turn off the feature.
Black wallpaper can increase battery
If your phone has an AMOLED screen (like most Samsung devices), use a dark-colored background. Black wallpaper can increase battery life because AMOLED screens only illuminate the colored pixels. Black pixels are unlit, so the more black pixels you have, or the more darker pixels, the less power is needed to light them up.