this action has been known to help battery life - especially after OS updates -
Clearing the Phone's Cache Partition:
NOTE: If your phone's performance is low, if the device crashes, freezes etc. then chances are that you're considering applying a factory reset. However, as you might already know, a factory reset will result in the deletion of all personal data stored on the device's internal memory, and it will return the phone's settings to factory values. As such, it's recommended that you first try solving these issues by clearing the phone's cache. By doing so, you won't lose any personal data.
1. Turn off the smartphone
2. With the device shut down, press and hold the "Volume Up", "Home" and "Power" keys
3. After the smartphone vibrates once, release the "Power" key but keep pressing "Volume Up" and "Home"
4. At the "Android System Recovery" screen, release all hardware buttons
5. From the recovery menu, press "Volume down" to navigate to and highlight "wipe cache partition"
6. Press "Power" to select the option
7. After the cache partition has been wiped, a "Reboot system now" message / option will be highlighted
8. Press "Power" to reboot your smartphone
How-to: LG G3: Clear the Cache Partition / App Cache; Reboot in Safe Mode