Originally Posted by itsallgood
I don't use any battery saving apps on my S4 and on average get 14 to 16 hrs a day with moderate/heavy usage with on screen time over 3 hrs. Connected to Wifi for about 95% of the time. Using bluetooth for about 1 1/2 hrs. I have 3 email accts to sync every 4 hrs and over 9 widgets that update throughout the day. If you set your phone up right, you should be able to make it thru a full days usage easily.
I think the key is you're connected to wifi so much. If you're in an area with a weak data signal, the battery life can be dramatically impacted, depending on your use.
I'm using Juice Defender on mine, makes a huge difference for me, especially since I'm often in areas with little to no data signal. I am rooted. But I also have JD on my wife's unrooted S3 and it works great there, too.