I have a solution that worked for me. My iPhone is now dropping 1% every hour on standby, with all of the iPhone 4s' "functions" enabled, such as Siri.
1. Backup data to iCloud.
2. Restore iPhone using iTunes. No need to backup to your mac! (it's on iCloud).
3. When setting up phone after fresh restore, disconnect from Mac/PC and set up the iPhone using the setup procedure.
4. Restore iPhone from iCloud backup.
5. When the sync has finished, power off your iPhone.
6. Remove SIM card (if you have one)
7. Turn on iPhone.
8. Go into Settings-iCloud and switch Off Photostream/Documents & Data/Find My iPhone.
9. Minimise Location services, but keep on whatever you want.
10. Go into Settings-General-Date & Time-Switch Set Automatically to Off
11.Go into Settings-General-Restrictions-Switch Ping off (you have to enable a passcode first theough).
12. Go into Settings-WiFi-Switch Ask to Join Networks Off.
13. Go into Settings-Store-Switch off Automatic Downloads.
14. Go into Settings-General-Reset-Reset Network Settings.
This will remove all stored network connections including your WiFi networks from the phone. It will also reset your other data connections to default. This includes 3G connections.
15. When your phone has restarted, switch it off and put your SIM back in (if you have one).
16. Turn the iPhone back on.
17. You'll need to re-enter WiFi information now.
18. Let the battery deplete completely until the phone turns off. Leave it off for 10 minutes. Plug it in and let it charge until it reaches 100%. Leave it plugged in for and extra 10 minutes just to be sure.
A word of warning, location services such as Maps and Find my iPhone use a heck of a lot of power, much more than the iPhone 4 ever used. The update rate of the GPS location is insane. It use to update your GPS location every couple of seconds on the iPhone 4. The iPhone 4s seems to update position every half a second when using maps. If Find my iPhone is doing similar things, no wonder battery life goes down so quickly.
I think that there is also a problem in the Documents & Data and Photostream settings somewhere. With these turned off battery life is dramatically better.