I went back after only 1 day of using my jailbroken iPhone 4. Just installing MyWi, Five Icon Dock, and 3G Unrestrictor left my battery draining about 50-80% faster without even activating tethering and also a little unstable in general. I restored to a pre-jailbreak backup and my battery is still draining about 50% faster. I don't have logs of my usage but I do know that browsing on 3G used to take 5% battery now it's 7-8% battery (better than the 10% when jailbroken). This kind of battery drain happened on my 3Gs after an update of one of the jailbroken apps and it SUCKED. it's making me regret jailbreaking my iPhone 4 since the restore didn't fix the battery drain. Any help would be appreciated. I'm not interested in restoring as new phone and I have experience using jailbroken iPhones since 1.1 and the battery drain wasn't bad until 3.1.3 and now iOS 4. Thanks!