After many users complained of battery life issues when they upgraded to iOS 5 and purchased the new iPhone 4S, Apple responded by releasing iOS 5.0.1. The new update was released a week after Apple acknowledged there were battery-life issues through iTunes and to iOS devices using the new update feature on iOS 5.
iOS 5.0.1 includes multi-tasking gestures for the original iPad, a security issue with the Smart Cover and the iPad 2, improved iPhone 4S dictation feature to Australian users and the battery-life fix. All have worked for iOS users except for the battery-life fix for some users. When iOS 5 was originally released, the battery life of the iOS devices, especially the iPhone 4S, were less than Apple announced.
With some users noting that they were getting a 5% loss every hour on standby with features turned off, Apple acknowledged there was an issue, and was quickly working on a fix. With iOS 5.0.1, some users are still seeing the same 5% loss of battery every hour, and some are seeing a worse than before 15% loss in 45 minutes with no to light usage.
Some users have found a solution to their battery issues by completely draining the battery to 0%, letting it stand for 10 minutes and then plugging in the iOS device and bringing it to complete charge. This update was, according to Apple, supposed to be a temporary fix while the company is continuing to find all the remaining issues.