The word is that ANY firmware updates are going to cause you some grief. And I think that is true for both the iOS and Android platform. My friend just told me that he collected his shiny new iPhone 5 and it started to run on overdrive, so I asked him what the symptoms were. He said the iPhone 5 would keep running hot, and drains the battery within four hours. I could have sworn he was using a Galaxy Note running Android 4.0 as what he explained was what I encountered during the early part of up new firmware update.
He had just backed up his apps to iCloud and downloaded them onto this iPhone 5. The fact of the matter was this, some of the apps were not optimized for use on iOS6 and on new hardware. This will cause the apps to run in circles, draining the battery in the process.
A clean install might work, reset the phone and download the apps once again from the store, but it remains to be seen if it will cure the battery drain issue once and for all. Let’s not forget that the new hardware needs to be optimized with the apps and unless the apps are reworked, chances are it won’t be running smooth. If you are using just a few third party apps, then you might be in luck, less problems means a smoother experience.
This puts the myth to rest that the iPhone is really a better platform. In fact, if you go round to the Apple forums, people are already talking about the battery drain issue on the iPhone 5 and not a peep has come from Apple regarding the issue.
I just got my Jellybean update for the second time for my Asus TF-300 and for once, there are no more coma problems. It runs smoother too. So for users of the iPhone 5, you just have to bear with it. If you have loads of third party apps that you used often, you have to wait for the new app updates.