Apple has just released the iOS 5.0.1 update and some users are still facing battery issues on their iPhone 4Ss. The iPhone 4S Battery Life forum thread in Apple Support Communities is flooded with complaints after users downloaded the update.
JohnMantooth - Upgraded to 5.0.1 this morning. Still draining at the exact same rate. Unplugged with a full charge 2 1/2 hours ago, and already down to 80% with light usage. Just lost 2% during a 15 minute shower. I see no difference at all.
On a more positive note, the majority of them felt that the over-the-air update (OTA) for iOS 5.0.1 worked reasonably well although a few of them were unable to receive the update because their phones' battery levels were below 50%.
Join the HardwareZone forum discussion on the iPhone 4S Battery Life here.