Hi, i thought i'd try to get this back on track. Iv had similar problems with my 4S since i got it in november and iv tried everything to try to fix it. First off i know my problem isnt as bad as many other people on here but i found after charging it to 100% and leaving it other night it would drop 30% in 8hrs. So apple were happy to replace it and called it a hardware fault. I tested the new phone after restoring from icloud back up and it was fine all the settings im used to having on and it dropped 1% over 8hrs sleep. So i forgot about it untill a few weeks ago i tested it again to find it dropped 20% over night. So i had it replaced and this time set up as new and havnt yet activated icloud and i havnt no apps installed. Iv been testing it my self to try to isolate the problem. Each night i charged the phone to 100% and tried a different setting to see the standby drain.
Setting Drain Total standby possible(hrs)
____________________________________________________________________
No settings active <1% >800hrs
Bluetooth only <3% 266hrs
Wifi only (ask to join on and off) >12% <66Hrs
Wifi only (no network connected). <1% >800hrs
Siri only <1% >800Hrs
Data (3G) only <1% >800Hrs
Location services (all services on) <1% >800Hrs
Wifi on plus all options >15% <53Hrs
3g data on plus all options <1% >800Hrs
Wifi & all options(no blue tooth) >14% <57Hrs
(Dnt take the possible standby too strictly i havnt tested it for 800hrs but i just worked it out from 8hrs usage.)
The last test here, i did just last night and this time i checked the usage stats, After 10 hrs off charge and 2 hrs since i woke up my usage is 10hrs standby and 5hrs usage. It should show 2hrs usage max. As you can see from the tests wifi is a big issue and i dont understand why
So thats it. If any1 wants me to try a setting or clarify any of the settings iv used then just ask ill keep testing untill i get IOS6 and then im going to do it all over again!