Reviving this thread, I just wanted to add one bit to my battery experience. I found at least one culprit for excessive standby battery usage (going from 100% to 84% in 6 hours of not touching the phone): my number was configured for a public IP address (called "Open Internet" by the provider), which means that it was bombarded with all kinds of traffic, and the modem barely went to sleep. Turning that off fixed my standby battery loss. Use time remains abysmal, on the other hand, but at least now it doesn't drop anymore when the phone is just lying around...
@maerz001, any chance of some more data from you?