Hello, I bought new HTC ONE S (Factory Unlocked-nothing rooted or fishy stuff) two days ago. As soon as I purchased it I upgraded my OS from ICS to Jelly Bean using HTC auto-update.So I was unable to test battery life on ICS however it is pretty bad now. This is new phone so I don't know whether the JB update has caused this problem because I see other users have also mentioned it. It can't last more than 2 hours on full use. Just played temple run for 10 minutes and battery dropped down to from 70 to 65% . So in 10 minutes of game play battery dropped by 5% . On this speed it won't last more than an hour on any hd video. Similarly on Wifi use or google market browsing it drops down quicker than my laptop battery. So is it normal for HTC ONe S or upgrade is causing this? I also turned on power saver option in new Jelly Bean but no improvement. What is the solution please I need help and I love this phone. (No apps stand out in draining battery life). Thanks Ahmar.