To those with battery problems.
We will be in a much better position to help you if you download
1) 'Better Battery Stats' app (either in the play store, or free if you are a member on xda site here http://forum.xda-developers.com/show....php?t=1179809
2) 'GSam battery monitor' app.
With these you can check up if certain apps are causing your battery to drain.
I previously had a really bad drain on my battery, which I overcame using these apps and some patience by testing day on day, my battery now lasts exceptionally well both whilst in use and in standby mode.
I would say its more than likely an app causing your battery drain rather than a problematic/faulty phone. I spent weeks thinking I had a faulty phone then discovered these battery apps to find the problem... my battery lasts very well now. It just takes some patience to find the culprit.
To help we need the full picture.
When you use these battery apps you need to see whats causing problems 'since unplugged'. With GSam battery monitor, if your problem is a standby mode drain pay particular attention to the apps sections 'View time held awake' and 'View num times waking device'. If your phone is draining excessively whilst the screen is on - we need to look at all sections then narrow it down.
Try these and report back with the findings/screenshots and we may be more likely to be able to help you.
We will also need to know your screen on time. Settings >> Battery >> click on screen and it will tell you the screen on time.