Re: IOS 5.0.1

The update is not yet available to the general public. 

'Good news if you're one of the iOS 5 users who suffers from crippled battery life: Most early reports are showing that iOS 5.0.1 fixes the problem completely.

"Frankly the difference is nothing short of amazing," said Wired reader Donald Kuntzman, who downloaded the update on his Verizon iPhone 4. "To go almost an entire day without a change in the meter reading seems unbelievable. Where before I could almost watch the battery drain, now it doesn't move at all."

Kuntzman noticed that the battery life on his iPhone degraded after the iOS 5 upgrade. He needed to charge his phone once a day, and always worried it would die before he had a chance to recharge it. He could practically "watch the battery drain," but since the update, his battery level doesn't seem to drop at all.'

http://www.wired.com/gadgetlab/2011/11/ios-5-update-improvement/