MacBook says it is fully charged at 99%

Discussion in 'MacBook Pro' started by brianfast, Jun 13, 2010.

  1. macrumors regular

    Jun 11, 2010
    My MacBook, "2 days old", from when I purchased it at the apple store says it is fully charged at 99% battery. I just re calibrated the battery last boot. Is this normal?

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  2. macrumors 603


    Apr 6, 2007
    Yes it is. Your mac will not charge the battery again unless it drops below 95%. anything 95% and above is considered "fully charged."

    This is to help prevent premature aging of the battery. There's little point or benefit gained from constantly cycling a battery every time it drops to 99%.
  3. Guest


    Sep 7, 2008
    forlod bygningen
    Yes. It will say that often between 95% and 99% percent.

    If you use MRoogle you will find one or two hundred threads about this.
  4. macrumors Westmere


    May 16, 2008
  5. macrumors newbie

    Apr 14, 2010
    I had the exact same problem this morning with a new MBP that I just got yesterday :p
    I tried unplugging the power cord and letting it run down to 98, 97, 96, to no avail. Then I let the battery run down to sub-90 and bam, it worked.

    But hey, at least I know why now haha. I guess next time 95 will be the magic number.
  6. macrumors 603

    Oct 22, 2007
    An Island in the Salish Sea
    Just to nitpick slightly.... but it's not really a "problem" if it was designed that way, and if it actually improves the life-span of the battery. :D
  7. macrumors 603


    Apr 6, 2007
    Not only is it not a "problem," but you're not really solving anything by forcing the battery to run down a little bit only to charge it right back up. You're just defeating a feature that was intended to prolong the life of the battery.

    Just use the battery normally, and if you're constantly plugged in, be sure to run the battery FULLY down (or close to it at least) once a month.
  8. macrumors 6502a

    Aug 22, 2006
    Chandler, AZ/Chicago, IL
    I purchased my MBP from a local Apple Store about a week ago. I have done a full battery calibration twice since then. Now my capacity is actually reading over what its suppose to...thats fine with me!

    ***Sorry about the image size. I originally made it half this size but you couldn't read anything on the screen...***


    Mod note: I've timged the image. Click on it for a larger version.
  9. Guest


    Sep 7, 2008
    forlod bygningen
    You can use CMD+SHIFT+4 to select the area you want to be shot

    or use CMD+SHIFT+4 > SPACEBAR > select window to make a screenshot of a window you select.

    In both cases the image is being saved to the Desktop as .png file.
  10. macrumors 6502a


    Apr 10, 2010
    Paradise City
    That's normal, don't panic about that...
  11. macrumors 6502a

    Nov 23, 2009
    Mine is much the same. Steady at 99%.
  12. macrumors member

    Feb 18, 2010
    Let your mbp battery drop below 80%. Plug it back in. It will charge back up to 100%.
  13. macrumors 603

    Feb 20, 2009
    99% vis-a-vis 100%?

    How many things in life have you discovered that proved to be 100%?

    As you recall that, then ask yourself, "in view of that, is 99% all that bad?"

    Just askin'....

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