After iOS 5 was released, many users began reporting battery life problems. After some time, Apple confirmed that the problem is real and a fix is coming. The leading candidate could be iCloud sync, but Apple's Developer Beta for iOS 5.0.1 only mentions "bugs affecting battery life." The release finally came on Thursday, November 10th — but on the 11th, Apple released a brief statement saying that a "few" issues remain.
Apple posts iOS 5.0.1 beta 2, fixes activation issues
Two days after it released the first iOS 5.0.1 beta, Apple has released beta 2 of the same build for the OS.
Apple confirms iOS 5 battery problems, fix coming in iOS 5.0.1
We have confirmation from Apple that there are, in fact, confirmed battery life problems that need to be addressed in the new operating system: