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Open Settings then Power management and check to see what is using your battery the most - This will help you narrow down what the cause is
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I suggest that you check what have drained battery under settings > power management > battery.
Please also check the following topic:
http://talk.sonymobile.com/t5/FAQ/Battery-time-and-enhancement-features/m-p/347874#U347874
You can manually adjust screen brightness or set it to adjust to light conditions which will help in preserving battery life
Phone battery is draining too fast after updating it to 4.3.
This is very unusual instead to getting better after update, its is draining very fast.
Xperial team please look into this matter
Rajjesh