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My macbook wouldn't charge to 100%

437 Views 8 Replies Latest reply: Dec 25, 2012 4:30 PM by Trane Francks RSS
neesie192 Calculating status...
Currently Being Moderated
Dec 21, 2012 9:02 AM

I  have noticed that my macbook wouldn't charge to it's full capacity anymore. It stops at 96% even when I charged it for ages, it still remains the same. It never used to happen like this before. I am running on mountain lion.

Anyone experience this?

MacBook, OS X Mountain Lion (10.8.2)
  • frederic1943 Level 6 Level 6 (9,980 points)
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    Dec 21, 2012 9:27 AM (in response to neesie192)

    Go to the Apple in the upper left corner and select About This Mac, then click on More Info (and then System Report if you are running 10.7 Lion or 10.8 Mountain Lion), then select Power from the left hand column of the System Profiler. Copy and paste the Battery Information from the top of the page back here.

  • Trane Francks Level 2 Level 2 (205 points)
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    Dec 21, 2012 6:33 PM (in response to neesie192)

    If it occasionally doesn't go to 100%, that's normal behaviour. Batteries are constantly changing their state of operation and the circuitry that figures out how much charge it can take, etc. is sometimes just a bit off.

     

    http://support.apple.com/kb/TS1909

     

    If the battery never reaches 100% anymore, then you're a candidate for an SMC reset:

     

    http://support.apple.com/kb/HT3964

     

    After resetting the SMC, you might want to calibrate your battery again:

     

    http://support.apple.com/kb/PH7261

  • LexSchellings Level 5 Level 5 (5,510 points)
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    Dec 24, 2012 8:09 AM (in response to neesie192)

    neesie, it is explained somewhere in the Apple manuals.

    When you connect the charger when the battery shows 95% or higher, it will no further charge.

    When you put the charger in when, for example, the battery is at 85%, the charger will charger will not stop at 95% but continue charging till 100%.

  • LexSchellings Level 5 Level 5 (5,510 points)
    Currently Being Moderated
    Dec 25, 2012 8:56 AM (in response to neesie192)

    Your battery capacity is around 75% of the original capacity. So the lifetime of a charge is lower than when new. Your battery is still good according to your battery information ("condition; normal"). using it until it is around 50% and then charging is the best way to enjoy the battery as long as possible (this keeps "the electrons moving"). Do not do a complete "calibration" often: it resets only the electronics and not your battery, and subtracts a full cycle of the life of the battery.

  • Trane Francks Level 2 Level 2 (205 points)
    Currently Being Moderated
    Dec 25, 2012 4:30 PM (in response to neesie192)

    The other aspect I'd add is that you want to use your battery at minimum of once per week. When it comes to batteries, "Use it or lose it."

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