Should Battery Life go down after a Calibration?

Discussion in 'MacBook Pro' started by sclough, Nov 3, 2009.

  1. sclough macrumors regular

    Joined:
    May 23, 2008
    Location:
    Kansas City, MO
    #1
    This is a little strange. I first had one of the June 2009 15" unibodies. According to Coconut, the battery was around 6500 original capacity. After I calibrated it, it went to around 6700 and it gave really good battery life. Then, the anti-glare option came out so I sold that machine at got one of the new anti-glare ones. The original capacity showed 6500 as well, but the current was only 6300 after one battery calibration. So, after using it for a few months, I calibrated the battery again. Now it's showing 6224 as original capacity. Overall battery life is less than my original June 2009 unibody. Sure the battery life is pretty good, but I miss the extra life the first one had.

    Is this just a bum battery, or am I missing something?
     
  2. miles01110 macrumors Core

    miles01110

    Joined:
    Jul 24, 2006
    Location:
    The Ivory Tower (I'm not coming down)
    #2
    Is it actually giving you less battery life (as in you've timed it doing some task and compared it with a similar test you performed on your previous unit), or are you just going by the numbers? My capacity reading fluctuates by ±200 mAh on what seems like a monthly basis. I wouldn't read too much into it unless you actually notice something is wrong.
     
  3. sclough thread starter macrumors regular

    Joined:
    May 23, 2008
    Location:
    Kansas City, MO
    #3
    The battery definitely doesn't last as long as the first June 09 unibody I had. I don't have scientific numbers to show the difference between before and after calibration, I just noticed Coconut's numbers went down when I expected them to go up a little.
     

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