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Have you installed any applications or restored any back up? I suggest that you charge your phone while it's booted into safe mode to see if you experience the same behaviour:
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008
Here is the image of my battery activities link : http://i.imgur.com/fQdumOs.jpg .
From what i check, there isn't any suspicious malicious apps i believe, as the apps i install prior before i send to sc & after is different.
If you check on the battery event log on the below of the image, is the log that last charged battery.
Take a look on 8:05pm, battery was charged till 92%, then it stay until 8:18pm & drop 1%, until I discharged on 8:38pm, it doesn't charged at all.