New MacBook Pro 2012 with battery health at 92%

Hi everyone!
Few weeks ago I bought brand new MacBook Pro (2012, 13"). After 12 cycles the battery health significantly decreased to 92%. Quite unexpected, isn't? Could you advise me what can be a problem? AC adapter, socket in my wall or something else?
To answer your questions, I did not put the battery below 10% during this time.
Thanks in advance for any hints!

You have to take the computer to the Apple store to have it checked out.
Genius Bar reservation:
http://www.apple.com/retail/geniusbar/
Best.

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