Like most people, I would like to get the most battery out of my phone as possibly. I have owned the S4 for 8 days and for the most part I am happy with it. I do feel like my battery isnt as good as what some others are posting though. The first couple of days i was getting between 14-18 solid hours on battery....that was with most of the air gestures and features enabled. The following is a list of things I have done since about day 3 or 4 of owning it to try and help extend my battery life. Set screen to auto-brightness Disabled alot/most bloatwhere apps Set screen timeout to 30 seconds Have turned off most of the Air gestures/ smart scroll and all that jazz Have a black wallpaper to help reduce the screen consumption Have bluetooth/gps etc off. ONLY things I have set to ON is Mobile data, Synce, Sound, Screen Rotation and Multiwindow I have set the screen animations and transitions to .5 in the developer options. Set the haptic buttons on phone to timeout at 1.5 seconds Under LOCATION SOURCES, the only box I have checked is Wi-Fi & Mobile network location Last, before locking my phone I always kill all my running apps. With all this said, my battery has been pretty much the same and hasnt changed. However, today I feel like my battery is all over the place. My phone has been off the charger for 2 hours and it is already down to 93% .I have made a 5 min phone call, checked facebook for 2 mins, on instagram for 1 min and sent 5 texts. I just feel like it should not have drained that much with so little usage. Under the battery settings, Android System has used 46% and screen is at 19%. Why is the system using so much? WhenIi first got the phone a week ago the system was no where near this high....screen was always the most consuming thing and all of a sudden its android system....any ideas? I have also just downloaded the Snapdragon Battery Guru app and it says it has to run for 4 days until my battery saving starts. I am looking forward to seeing if it actually does work or not. Im hoping this thread can help others out with their battery life and have a place to post and discuss what you do to get your great battery life. Posting what you have on/off, screenshots and some other settings to save battery would be helpful.