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Settings > power management > battery > check what has been using the battery, also you could repair the phone with PCC
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
Have the same problem 1 day using the phone battry show 2+ days but the 2nd day it only show 1 day and phone bat drains fast did a factory reset phone back in 2days battery life after 2 weeks i charged it with phone turned off now its back in 1 day and drains fast again..... im trying PCC now
after PCC battery life back to normal 2 1/2 days showing on full batt.. but i had to install all my apps again..
how can you do that