Why the iPhone 4 16GB drains out the battery faster after upgrading to ios 5?

Why the iPhone 4 16GB drains out the battery faster after upgrading to ios 5?

Not sure, but try this:
Let the battery drain to below 20% (I went to about 14%).
Plug your phone in and leave it to charge COMPLETELY. This took my phone somewhere around 4 hours to complete.
When you're done, you may have better luck keeping a charge.
iOS 5 adds a lot of additional communication, and every time you connect wirelessly to anything, more power is used. Even so, some people report that a battery cycle like this helps. It seems to have worked for me.

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    rajivrp wrote:
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    Message was edited by: Apelsincheg

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