Get Betterbatterystats from the play store and root your phone.....Watch for Google play services wavelock it's a known problem and huge battery drain.
Sent from my SM-P600 using XDA Premium HD app
Check this thread for a lot of useful information: http://xdaforums.com/verizon-lg-g3/general/g3-tweaks-battery-t2825332 Most of the things discussed in this thread will help you to maximize your battery life. You must have root, and a few of the apps are WAY more useful with the paid/full version.
