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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
Well in that case I suggest that you check the following topic:
Well in that case you may want to have you your phone examined by a service center. Please contact your local Xperia support team for more information:
http://www.sonymobile.com/global-en/support/contact-us/