Yeah, thanks. I was just thinking of doing a factory restore but came here to see if anything new came up.We don't experience the same battery drain as you do. To me, there are 2 possible causes:
1. Bad battery
2. There is an App on your phone that runs in the background and it drains the battery.
To check if it is an app, wipe the phone back to factory settings, don't install any other Apps, then put in your SIM card and monitor the battery drain. If it still drains fast with no extra apps installed, then you do have a bad phone/battery. If there is no parasitic drain, then it is most likely an app that you installed and it drains the battery.
I'm going to go do that now.