This user reports that the battery dies within one hour:

I’ve had the new iPhone for about 3 months now. I have to say if I had known the battery life would be this bad I would not have even considered buying this phone. If I play games, check email, go online, or use apps the battery will go from full to dead within less than an hour. What is up with that?? isn’t the point of creating a device like this to make it convenient for us to do multiple technological activities in our daily lives??!! how the hell can I do that with one hour of battery life…ugh!! Unless my iPhone is really defective apple needs to do something about this.