Charged battery says 8hrs, used for 2min and it went down to 4hrs....Why?

I fully charged my macbook (purchased 11/09). The battery icon at the top of screen said i had 8hrs remaining. I used the laptop for 2 mins on the internet and checked to see how much time it used up ( I believe when I bought the computer it said something about the battery charge lasting 7hrs and I new I wasn't getting this). The battery icon said I had 4hrs remaining. Why did the time get cut in half when I only had the computer on for a few mins?

I just had a similar experience, but in reverse. I had been using my Macbook for about an hour and a half, and it went down to 20% (and it said that I needed to replace it soon). I quit my browser, and the battery immediately jumped up to 55%, and no replacement message.
From what I gather, it has something to do with recalibrating batteries, but in your case, your battery is pretty new, so that doesn't really make sense.

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