When I Was on iOS 4.1 (Unjailbroken). My Battery Lasted About 3 Days Stand By With A Bit Usage (Facebook & Game / Email ). Now My Phone Is Jailbroken & Battery Isn't All That. I am now testing how many percent goes down within one hour stand by. And I'm also going to test how many percent goes down over night. I am disappointed with this battery life because It was great before jailbroken. Also, What Cydia Apps Do You Know That Battery Drains?