Recently updated from 4.1 to 5.1 using Redsn0w custom ISPW to keep 1.59.00 BB. Not sure if it's my imagination, but the battery life seems much better than it did on 4.1 (jailbroken or not - I had both). Is this a feature of 5.1 others have noticed? Is this something inherent to the NO_BB IPSW? Not that I'm complaining - just curious as to others experience.