Macbook charges to 99, 20 minutes later to 100- problem??? Help?

Hey, first time here. I've got a question and maybe a problem. I got a macbook last week and the battery has been doing the same thing the whole time. When i charge the battery, it'll charge up until 99%. Then, it'll say "Calculating.. Until charged" for about twenty-30 minutes. This happens after the calculated time goes down to zero and the lightning bolt icon turns to a plug. About twenty to thirty minutes later, it'll say 100 percent and the magsafe will turn to green. Basically- the calculated time is wrong? im not really sure, but i'd like the resolve this unless it's normal. Thank You in advance.

thiswho wrote:
This is normal?
Cause it bothers me a little bit that the time will say 0:01 until charged, and then hit the Calculating..Until full, and twenty minutes later be charged. Anyone else with this problem or know how to resolve it? I like my electronics to be accurate so you can understand why this is a little bothersome to me. Thanks in advance.
Electronics are accurate batteries are not. If you want something more accurate you will need to develop a different battery chemistry and a different charging method that Li-Ion batteries don't use and isn't capable of. You would be best to not use batteries at all if you want real accuracy as there are many factors that can affect charge and discharge rates.

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