Was there any change on your usage? I would suggest to give your phone a couple of charge/discharge cycles more and then observe if there's any progress on the battery life.
Also, one of our friends here made an article Battery life tips for Lumia family Windows Phone devices. You may want to check it here: http://discussions.nokia.com/t5/Pool-of-Knowledge/
If above wouldn't help, you can check the link provided below for troubleshooting steps: http://support.microsoft.com/kb/2606900
If you've done all the troubleshooting steps provided on the link above, you may consider sending the phone to a repair facility for assessment. You can go here to select the support website of your country for any repair inquiry/instructions: http://www.nokia.com/global/support/locations/
How did you determine it is draining faster than it should?
What would you consider faster?
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