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I went to the apple store for my battery and they ran a diag on it. Found several apps that were constantly crashing. We removed those apps and reinstalled the OS. Since then my battery will go a full day with no problem. iPad has had no issues since the upgrade to 5.

Care to share what apps?
 
I had an iphone 4 and the battery will always be longer than a day.
after the upgrade to iOS 5 I have not noticed any changes in the battery.
When I bought the iphone 4s I made back up from the old phone so all the settings are not changed, but the new phone battery is very different.
Iphone 4s always discharge end of the day.
This is not a iOS5 problem, it just falls short battery work on a new processor and the phone internal conversion.
If Apple really wants to extend iPhone 4s battery, let it replaces it in the more powerful.
 
It is a software issue. The CPU of my iPhone 4S (I use the Monitor App) goes all the way up to 100% in idle. All Apps closed and in flight mode. After some time, it goes back to normal usage, like 10%. Then, if I lock my iPhone and unlock it right after, the CPU usage goes back to 100% and stays there. In that state, I loose about 1% battery per minute. Very annoying.
Here the picture:
 

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I found the solution for me. Tried to disable several things for several hours now and I finally found something. I disabled my calendar notifications and the CPU usage went down to 10%, normal. When I enable it, it goes back to ~100%. Maybe it will be helpful, try it out.
 
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I found the solution for me. Tried to disable several things for several hours now and I finally found something. I disabled my calendar notifications and the CPU usage went down to 10%, normal. When I enable it, it goes back to ~100%. Maybe it will be helpful, try it out.

do you have any events in the calendar or is the calendar empty? thats a very interesting find.
 
do you have any events in the calendar or is the calendar empty? thats a very interesting find.

Yes there are events, several in fact. After I found out that it is caused by the calendar, I went through the events. There was a meeting with an invitation. After I "Accepted" the Invitation, the CPU usage was back to normal.
The reason why I suspected the calendar notification was because another event that was shown in the notifications menu was kind of flickering. Looked very strange. There was an "X" icon/button to the right of this event to close it, but it couldn't close it. I will try out some things today and post the results.
 
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