iPhone 4 iOS 6.1.2 battery drain?

is anyone else experiencing battery drain on their iphone with the 6.1.2 update? it certainly has affected my phone, and dont try to tell me otherwise because before i updated to this firmware my phone battery was just fine, i updated and didnt change any settings or anything like that and my battery just naturally sucked. i turned push off for mail, deleted it restarted my phone and added the email again, didnt work i pretty much turned every setting off which is stupid because it defeats the purpose of a "SMARTPHONE" but my battery life is still horrible. i used to get a good 7-8 hours of usage and a day standby but now i get about half that, maybe even less. any help or information about the next update would be appreciated.