Apple is investigating several reports of people complaining about poor battery life for their iPhone 3GS users after they upgraded to the 3.1 firmware. The 3.1 upgrade did deliver a lot of new and useful features but this was not what some people were expecting. There are several iPhone 3GS users on the 3.1 firmware that are looking for solutions to this problem but unfortunately there are not any kind of fixes right now, the only thing that could fix this is downgrading your iPhone to 3.0 or 3.0.1.
Apple is now offering (for download) a battery life logger, which will collect information about your iPhone’s battery life. The logger syncs the data with iTunes and sends it off to Apple for investigation.
Also, some of these people have tried restoring, which is what most apple help center’s would say to do when experiencing battery issues, but it still does not work. Some things that could slow down your iPhone and run the battery out faster is using push notifications, frequent vibrating, and running apps or the internet in the background.
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