I had the same problems as everyone else regarding loss of power in a dramatic (10-15% drop an hour) way on my iPhone 4s. I was forced to turn off most of the functionality of the phone to conserve power, and still needed to charge at my office and on the drive home in addition to overnight charging. I downloaded the 5.0.1 (9A405) update through ITunes yesterday and charged to 100% at about 4 P.M. yseterday EST. I turned on location services, including camera, apple store, maps, siri, weather, and find my iPhone. I turned on Compass calibration, cell network search, setting time zone (the big killer before) and traffic. I turned on Siri raise to speak, and I have bluetooth and wifi running. I turned on iCloud contacts, calendars and find my iphone. I turned on iCloud backup. I switched fetch new mail from manually to push (i'm using exchange to get my gmail, contacts and calendar). I have turned on notifications for phone, messages, weather widget, calendar, mail, stock widget, facebook (I reloaded facebook because on some complaints it seemed to be a battery problem.). I did keep the iPhone from reporting diagnostics and usage though. In short I turned almost everything on that was previously turned off. I also turned on kypass which links updates to dropbox which also previously negatively effected battery usage.
I am now (0740 EST) at 51% and this includes about 2 hours and 52 minutes of netflix, web use over wi-fi, emails, and music. according to time since last fiull charge I have 2 hours, 53 minutes of usage, and standby of 14 Hours and 54 minutes. All my contacts are still there in my phone directory, being synched with google contacts, as are all my calendar appointents, again through Google.
Compared to before the update where my phone would have been dead in about 6 hours with minimal use and most everything turned off, this update really seems to have fixed the problem, allowing me to start using all the new features.
I am going to run the iPhone battery down all the way to 0, if it lets me, then do a full recharge and again watch the usage to see if the fix remains in place. It should, but I want to make sure. Hope this is an insight into other user experiences regarding the update.
Message was edited by: Captain Zabel