Macbookair battery health problem?

I recently purchased a mid-2011 Air 13' i5 128gb and after 1 week of regular use, the battery health decreased to 95% (iStatPro and Coconut Battery). The battery life is of 5 to 6 hours doing word processing and Safari. The original stat of the bat was 98% and Coconut says that the battery has incredibly 28 weeks of life...
Is it normal? Do i have to concern about?
Thanks.

Hi, SP Forsythe,
I finish calibration and the stat is 96% and the current battery capacity rise from 6429 to 6452.
I`m a little bit relaxed about the "problem" after reading this thread that make sense to me.(https://discussions.apple.com/thread/2090860)
that says: "There is no problem. Simply do not give the ±5% to 10% battery health estimate any credence. Ignore it. It will fluctuate up and down, and the fluctuations have no significance whatsoever."
The point is that after spending lot of money in that little thing I don't wanna play with casualties...I'm going to the authorized representative to make a test. I just don't know if I can really trust this guys, after all, it's not good for them to return the product. And the problem looks like not important.
I don't know, let's see whats happen. After all, thanks for the help.

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