[jyl]

I think the battery life problem can get solved with a software release. Previous iOS versions have had poor battery life then it was fixed.

It is very likely nothing hardware related. Yes the processor is dual core, but one core can be turned off when not needed.

For now, I have done almost all the tricks mentioned, and my phone still drains too quickly when it is being used. But if I put it to sleep (power button), no problem. It still receives phone calls, texts, does alerts, etc when asleep.