Serious battery issues since iOS 6.1.2

ok, im sick of all of the users on the forums saying "oh learn how to use your device" "it is not ios, its the way you use your phone" i used to get 8-9 hours of usage on my iphone 4 before ios 6.1.2. as soon as i updated, that changed. im lucky if i get about 5-6 hours of usage, and its verrry light usage. i did not change any settings, install anything new or anything like that. i already know once i post this there will probably be 10 people telling me to stop complaining and that it is my fault for my battery draining. but i really dont care, i have the right to complain!