We're hearing several reports that the iPhone 4S battery is not as good as the iPhone 4. People are reporting battery drain and it seems dramatically different than the iPhone 4. Is this due to the dual core processor, Siri, iCloud, or something else? So far my Sprint iPhone 4S doesn't last quite as long as my AT&T iPhone 4, but I wouldn't call the difference dramatic. I suspect the CDMA radio probably takes more juice than GSM but that's just a guess.

Here is a battery comparison chart from iLounge who did an extensive iPhone 4S review:



How is your iPhone 4S holding out?