Install juice defender and set mode to at least aggressive. Each time you finish session, close all apps by pressing home button at least >2 secs and use RAM Manager to clear memory and remove all apps. Use delete icon to delete all opened windows. Shut off GPS and wifi connection before you finish. I do it this way and get 4-5 days standby on single charge. Previously, before Jelly Bean upgrade, I get up to 6-7 days standby battery charge. Maybe Jelly Bean has some issues. If all else fails do factory reset.

This post has been edited by Tookia: Nov 16 2012, 08:47 AM

Mine was bought soon after launch in Malaysia. Until now works beautifully with no problems and even upgraded to Android 4.1.1 Jelly Bean. Unrooted device though. Maybe it was the made in Korea batch?