[PPCGeeks4ME]

I'm running stock, unrooted, and after a 16 hour day my battery is usually around 50%. That's with really light usage, though. On heavier usage days it probably gets down to about 30-40% in the same amount of time.

Data always on, 4G off, GPS on, Bluetooth off, WiFi off, OTA update (this helped a lot), auto screen brightness, no ATK.

You'll find that people getting 30+ hours with moderate use have one thing in common: WiFi. Using the WiFi radio instead of the 3G radio seems to save a considerable amount of battery life.

Likewise, people only getting 2 - 4 hours must either live in an area with really bad coverage or be streaming HD videos continuously or something.