My Iphone had pretty good battery life. I never actually measured it but battery life was generally quite good. About a week ago or so I updated my OS to the newer version and this last week I have noticed that day by day my battery life has been getting worse. I pretty much turned off everything and closed all running applications and still within about 2 hours time my Iphone 4 lost about 21% of battery life. 
I do not have many applications on my Iphone 4 and do not have mail switched on to fetch mail. No Bluetooth,No wifi switched on either
I like the new features after the update but the battery life drop is not just on the new Iphone 4S but now on the Iphone 4's as well so I reckon it is something to do with the new OS.
I do not have many applications on my Iphone 4 and do not have mail switched on to fetch mail. No Bluetooth,No wifi switched on eitherI like the new features after the update but the battery life drop is not just on the new Iphone 4S but now on the Iphone 4's as well so I reckon it is something to do with the new OS.