I posted this in the Batterygate thread, but my results are telling enough that I thought a re-post as a new thread was worth it. My situation: My wife and I have Sprint 16 GB iPhone 4Ss. From the very beginning, I had noticed my wife's 4S had no battery issues, and was vastly outperforming mine. After similar usage today in similar network conditions, after 8 hours, her phone had 52% and mine had died. So, I did a full charge of both phones back to 100%. Before taking them off power, I ensured the phone's key components were identical (WiFi, Mail, Location Services, etc.). We have one Gmail Exchange account set to Push. I put them in the same physical spot so 3G radio strength wasn't a factor. At 9pm CDT, I unplugged them. My phone took a long time to get from 99% to 100%, her phone didn't. Mine also went to 99% upon unplug, her's didn't. At 10:15pm CDT, all in standby mode with no usage...her phone remains at 100%. Mine is now at 92%. That's roughly 1% every 10 minutes on my phone, same thing I saw earlier today during stand-by usage. I think this, for me at least, confirms the diverse results folks are seeing. Some folks are seeing major battery issues, some are seeing better battery life over other iOS devices. It just so happens in our house, we have one of each. Why would two identical phones behave so differently? I've exahusted all possible options on my phone, including the recently posted attempt at deleting e-mail accounts and resetting network settings. Now, I am off to restore my phone. If this fails, it's the Genius Bar. And I'll be taking both phones with me to show the issue.