I have an iPhone 4 and before the iOS 5 update the battery hasn't lasted as long as it used to. I used to be able to watch YouTube like.. All day and it would still have half it's bettery by the time I went to bed. And if I only browse the Internet for a little, played some apps, listened to music, and texted some, the battery would be pretty much full by the end of the day.
But now I end up having to charge it by like 9pm
What's causing this and how can I shut that feature off

But now I end up having to charge it by like 9pm
What's causing this and how can I shut that feature off

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