Some of the users were facing battery issues on their iPhone after updating into iOS5. Dues to this, Apple try to work out this issue. A few weeks later, Apple decided to issue iOS5.0.1 to fix battery issue. However, we have though the problems would have been solved but there a majority users states that the problem still persists. Looks like Apple had failed to fix this issue.
Hopefully, they work out another update to reticy the problem as soon as possible.
For jail breakers community, please do not upgrade to iOS 5.0.1 if you wish to jailbreak your phone.