Iphone 4S battery drain with iOS 5.0.1

I am experiencing just about the same battery drain with the iOS update as I did before.
I was wondering how many of you had the battery drain problem, updates to iOS 5.0.1 and had that actually solve your battery problem.

I have IPhone 4 and I updated the IOS to version 5. After the update the battery lasts about a day. After the update to 5.0.1 the battery lasts a day and a half. It is an improvement, but not as I expected.
The next step is to disable configuration options like:
- downgrade from 3G network to 2G
- disable Data services
- disable automatic clock
- disable location services
- use the phone only as a phone and nothing else.
I will come back to tell how much the battery lasts.
PS: the IPhone 4 is new so there is no problem with the battery itself.

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