Changing the password for your Outlook account on a Microsoft exchange server sends the iPhone 4 and the iPad into a tizzy of requests to the email server and can drain the iPhone battery in only a few hours. Changing the password on the iPhone in any way does not correct the problem. Only wiping (deleting) the entire business account and all of the data and re-installing it will fix the battery drain. One sure way to tell if this is the cause of a iPhone short battery life is when an call is being made the background on the phone flickers or flutters. This is due to the radio being taxed by both the call and the requests to contact the Microsoft exchange email server as many as 5 times a second. Can I smell firmware update? I can just as well as I can smell overheated iPhone 4 with short battery life.
Even with that said the iPhone is the best phone the Supreme Pundit has ever had.