Users have been complaining about their issues on Apple's support forums, with complaints surpassing 300 pages and it seems that the update has even made the battery issue worse for some than it was before.
Meanwhile Apple has acknowledged the problem in a statement given to AllThingsD
The recent iOS software update addressed many of the battery issues that some customers experienced on their iOS 5 devices. We continue to investigate a few remaining issuesThe update when it is ready will be made available OTA. Meanwhile you can disable power hungry applications and push notifications to maximize your battery performance.
Are you an iPhone user who is facing battery issues? Share your experiences in the comments section which follows.