Previous 1 2 3 Next 29 Replies Latest reply: Apr 11, 2014 1:15 AM by PlotinusVeritas
mondesigns Level 1 (0 points)

My 2011 15 inch macbook pro battery life capacity went from 97 percent (6500 something mah) to 83 percent (5732 mah) over night. I shutdown my macbook pro but forgot to switch off the power last night.Help!


MacBook Pro, Mac OS X (10.6.8)
  • Bimmer 7 Series Level 6 (10,275 points)

    Try this: It might or might not help but it's worth a try.

     

    Do a SMC/PRAM reset.

     

    Use your battery until it's down to 30% and then recharge it to full and see where your battery capacity is at.

     

    Let me know if that works for you.

  • mondesigns Level 1 (0 points)

    Already did the SMC reset. Now i am draining the battery for Calibration. I calibrated the battery just 1 and half week ago. Thanks for the reply.

  • OGELTHORPE Level 8 (45,195 points)

    Do not drain your battery.  Your MBP does not require calibration.

     

    http://support.apple.com/kb/HT1490

     

    I'm not certain that you even have a problem.  It is possible that what you thought was was a shutdown Mac was not the case.

     

    Ciao.

  • mondesigns Level 1 (0 points)

    But its battery capacity not the battery charge that decreased from 97 percent to 83 percent. I don't know what to do so i am calibrating the battery. Thanks for the reply.

  • eww Level 9 (52,980 points)

    Again, your MBP's battery doesn't need calibration and won't benefit from it. If you think the battery may be defective, take the machine to a Genius Bar and ask to have it tested.

  • mondesigns Level 1 (0 points)

    Thanks for the reply but the battery may not be defective because i am already past 6 hour of use with continious web browsing on battery and still 27 percent battery left( which is normal for my macbook pro). I am really confused because coconut battery and istat both says battery capacity 83 percent( yesterday it was 97 percent). I know calibration might not help but i want to try it before i take it to apple authorized dealer. No Genius Bar in my country(i m from Nepal). By battery capacity i mean battery health (not charge) just if anyone is confused.

  • OGELTHORPE Level 8 (45,195 points)

    Take it to a repair facility if you like but by draining your battery you are doing it a disservice.  It will not help but just shorten its life span.

     

    Ciao.

  • Bimmer 7 Series Level 6 (10,275 points)

    As mentioned by others, draining your battery fully might do more damage than good to your MB.

     

    That's why I've suggested you run it down to 30% then recharge it again.

     

    OG and EWW's suggestions about not calibrating your battery is dead on.

     

    We're all giving you sound advice.  We wouldn't want to see you here in a month's time stating that you're battery is dead after a few months of use.

     

    And since you've mentioned that you've already reach the 6 hour point with your MB on batteries, your MB's battery is in good condition.

  • mondesigns Level 1 (0 points)

    Okay then i will charge it right away. Thanks.

  • Csound1 Level 8 (46,982 points)

    mondesigns wrote:

     

    But its battery capacity not the battery charge that decreased from 97 percent to 83 percent. I don't know what to do so i am calibrating the battery. Thanks for the reply.

    Don't calibrate the battery, that will decrease its life!!

  • mondesigns Level 1 (0 points)

    Ok i started recharging the battery from 19 percent. Its fully charged now but battery capacity is still 83percent. Its stuck at 5732 mAh. Before when i used to charge and discarge the Macbook pro battery capacity used to fluctuate now is permantly stuck at that mAh. I am lost here.

  • mondesigns Level 1 (0 points)

    Update: May be my battery chip which measure battery life is fried because i am at 99 percent charge still it show 24 min to charge fully. Still stuck at exactly 5732 mAh with no fluctuation at all during charge or discharge. Thanks for the help guys.

  • eww Level 9 (52,980 points)

    If this is still true after another SMC reset, you have a hardware problem that needs repair.

  • mondesigns Level 1 (0 points)

    What kind of hardware problem do you think? I mean battery problem or the other hardware problem. I can change battery in a year's time but other hardware will be problem.

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