I've upgraded to 4.2 and love the folders and other benefits but ever since upgrading, battery life has noticeably changed for the worse. I've read the thread on here about discharging the battery and then doing a full recharge but it hasn't worked for me. As much as I want folders etc, I want the excellent battery performance I had before more. Does anyone know if it is possible to revert back to the previous IOS version and if so how it is done? Is it just a case of restoring from my last pre 4.2 backup?