After 2 iphone replacements for severe battery drain, updating to 5.0.1, and countless hours of trial and error... I have come to the conclusion that iMessage is the BIGGEST part of the battery drain. After testing this fix on my device I can report a MAJOR difference in battery drain. Please try and post your results here:
* Restore iPhone as new (DO NOT use a back-up)
* Immediately after restore, turn-off iMessage
* Reset Network Settings TWICE.
* Restart phone by holding power + Home button.
* LEAVE iMessage OFF
NOTE: You must follow these instructions. It seems that just turning off iMessage does not stop it from doing background operations/connections.
Enjoy you new iPhone without the battery drain.
* Restore iPhone as new (DO NOT use a back-up)
* Immediately after restore, turn-off iMessage
* Reset Network Settings TWICE.
* Restart phone by holding power + Home button.
* LEAVE iMessage OFF
NOTE: You must follow these instructions. It seems that just turning off iMessage does not stop it from doing background operations/connections.
Enjoy you new iPhone without the battery drain.