The other day I pulled my iphone out and nearly dropped it! It was burning hot and there was a big red low battery indicator in the middle of the screen! I had charged it only a couple of hours earlier so it was not likely that normal use had caused this condition.
I was in a wireless area, and had been checking my gmail earlier. The little activity indicator at top left was twirling.
A search through Apple support and discussions led me to this article. It seems that the iphone can get stuck in a checking-mail loop, particularly on certain IMAP accounts like gMail.
An Apple support article also says that a flaw in the Mail application in v. 1.1.3 causes it to persistently generate server activity even when it is not checking mail per user settings. Persistent mail checking can quickly drain the battery.
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