Yesterday, Apple pushed out iOS 5.0.1, just about four weeks after releasing iOS 5 to the masses. Among the reported fixes: battery life improvements, following a confirmed bug in the initial release. We're hearing reports that battery life remains an issue for some iPhone 4S owners, however, and that it's been reduced even further for others.

http://www.engadget.com/2011/11/11/p...pdating-to-io/