Guys,
    I believe many of you have moved or plan to move from your previous iphone to iphone 5, all of us will do this to backup & restore it to new iphone5 via Itunes. This is the simplest and easiest way to bring up our iphone5. HOWEVER, there is a bug that will drain you battery. It is widely discuss in apple forum & i am one of the victim.

1.) A fully charged iphone 5 is unplug from charge at 8.30am and i suffer battery drain issue where around 5 pm onward. The battery only left around 20%, each time reach home the 1st thing i do is to charge the phone. At first i though it was normal due to a larger screen and a faster dual core processor clocked at 1.3Ghz, no phone can have better battery life, also my usage is WIFI never turn off with 3G data plan + 3 PUSH email acct receiving email daily. I even got myself a new lightning cable for backup purposes if i need to charge my iphone5 before i manage to get home on time.

2.) until, i read a post in apple forum 2 weeks later after i own the phone. There is a bug from restoring previous back up to iphone 5 on IOS 6.0.1. A simple solution is to Navigate to SETTING- GENERAL- RESET- RESET ALL SETTINGS. That is all !! After few days monitoring, the battery improve was dramatically !  Now until 6pm, my battery life is still left 62% compare to before 20% ! I am very happy to discover this and wish to share with all forumers here! Thanks and i am a happy iphone 5 owner now !