Share your experience!
Different phones, this is my suggestion, reinstall the latest update with PCC, update all the apps and turn off auto update and auto back up > report back in 2 days
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
Run PCC > suport zone
I have experienced the same.. it says that with 4G it could run up to 500 + hours.
Now when fully charget it estimates it to be done in 20 hours.
i have shut down wifi, but are running bluetooth because of the smartband.
I think the the gap between 20 and 500+ is a lot, if it said 200+ hours, I would say ok, but 20? Come on Sony 
There must be something wrong with the software or something else.
Looking forward to hear if reinstalling the os helps.
Best regards a Sony freak...
Bjørn Harald Paulsen