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  1. #1


    Member Since
    Jun 19, 2009
    Posts
    30
    Unhappy Macbook pro battery health question
    Hey guys, my macbook is about four months old, i calibrated the battery once about a week after i got it and now istat is showing the battery health at 94% after 46 cycles. It was at 96% around friday and now it's gone down 2 percent in five days so i am a bit worried about this. I guess my question is if this is normal, should i do another calibration?

  2. #2


    Member Since
    Jun 19, 2009
    Posts
    30
    Anyone?

    I let it drain and left it overnight for at least 10 hours before recharging it again and now it shows the battery health is now at 93%. At this rate i'll be totally out of battery in a few months.

  3. #3


    Member Since
    Jul 05, 2009
    Location
    Downey, CA
    Posts
    2
    Specs:
    MacBook Pro 13.3" 2.26Ghz 2GB RAM 160GB HD
    hey i feel you! i've had my mbp13 since beginning july. i've calibrated my battery about 4 times so far and just like yours. i charge it to 100%, leave it plugged in for an extra 2 hours, then drain, and let it chill for 5 hours plus. my battery health was 97% yesterday, and just decreased to 96% today.
    what's the deal? our their defected batteries out there?

  4. #4

    ImageX's Avatar
    Member Since
    Aug 17, 2009
    Location
    East Bay, CA
    Posts
    440
    Specs:
    17" MBP C2D 2.8 4GB OS X 10.8 | iPhone 5
    Quote Originally Posted by Guinness83 View Post
    ... should i do another calibration?
    Yes. The battery should be calibrated at least once a month.
    "The early bird gets the worm, but the second mouse gets the cheese."

    Remember to use the Reputation System!

  5. #5


    Member Since
    Oct 29, 2009
    Posts
    70
    Avoid doing a complete charge/discharge cycle to calibrate it too often though as it'll shorten the battery life.

  6. #6


    Member Since
    Aug 28, 2009
    Posts
    147
    Quote Originally Posted by MunkeyQ View Post
    Avoid doing a complete charge/discharge cycle to calibrate it too often though as it'll shorten the battery life.
    How do you figure that? Maybe if it was a 12v car battery - but not a modern Lithium based battery.
    The laptop battery circuitry cuts off the computer before the battery voltage gets low enough to damage the battery - just like it can't over-charge it.

    Don't worry so much about the battery - use it and when it finally fails (it will), buy a new one. The batteries don't mind being ignored, and all of this recalibrating, cycling and being careful doesn't help - so why worry?

  7. #7


    Member Since
    Oct 29, 2009
    Posts
    70
    Quote Originally Posted by ticedoff8 View Post
    How do you figure that? Maybe if it was a 12v car battery - but not a modern Lithium based battery.
    The laptop battery circuitry cuts off the computer before the battery voltage gets low enough to damage the battery - just like it can't over-charge it.

    Don't worry so much about the battery - use it and when it finally fails (it will), buy a new one. The batteries don't mind being ignored, and all of this recalibrating, cycling and being careful doesn't help - so why worry?
    The charge management IC will take care of preventing overcharge and under-voltage conditions, but each time you cycle any battery it reduces its capacity. So if you're recalibrating your battery every week, it's not too good for it.

    I've built a few Li-ion pack chargers based around TI chips and from what I've learnt, cycling a Li-ion completely is by and large unnecessary unless it's a smart battery with an SMBUS interface.

  8. #8

    iggibar's Avatar
    Member Since
    Apr 20, 2009
    Location
    Cleveland
    Posts
    4,079
    Specs:
    4.1 Mac Pro. 15" MBP. 13" MBP. 17" PB. PM G5. iPhone 6S+ 64gb Gold. Apple Watch 42mm.
    Quote Originally Posted by MunkeyQ View Post
    Avoid doing a complete charge/discharge cycle to calibrate it too often though as it'll shorten the battery life.
    I beg to differ. The ONLY way I charge/discharge my battery is using it while it's charging, then use it while it is unplugged(not charging) until the battery goes down ALL THE WAY, and then start back up and charge it. Yeah, some people say it's time consuming...but I have a minute of time to spare to ensure my battery will last...and so far, it shows! As you can see from my istat, I have 200 cycles with 100% battery life
    dashboard.jpg
    Baybe you just have a defective battery

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