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Macbook shutting down when unplugged even though battery says 53%

3497 Views 7 Replies Latest reply: Aug 27, 2010 7:00 PM by Matzky RSS
shelcastillo Calculating status...
Currently Being Moderated
Aug 23, 2010 9:45 PM
My macbook seems to shutting down unexpectedly. I notice that the fan will be on full blast and when I am using Safari the CPU % is at 112.2 the battery will display over 30% and then all of a sudden it shuts off. It will not start back up unless I plug it in.

Message was edited by: shelcastillo

Message was edited by: shelcastillo
MacBook Aluminum, Mac OS X (10.5.8)
  • thomas.schneider Calculating status...
    It's possible your battery isn't [calibrated|http://support.apple.com/kb/ht1490] correctly. In addition the battery itself may have a hardware issue.

    Try using [Coconut Battery|http://www.coconut-flavour.com/coconutbattery> to see the capacity of your battery that remains.

    Lastly, it's possible your computer is overheating for some reason, as your symptoms seem to point to that as well.
    Macbook 2GHz Intel Core Duo, iMac 2.66GHz Intel Core 2 Duo, Mac OS X (10.6.4)
  • Jay Bullock Level 4 Level 4 (3,800 points)
    Go to Applications/ Utilities/ System Profiler. Select "Power" from the menu on the left. Copy and paste here what it says about your battery.

    When you note that Safari is using 112% CPU, what are you doing at that time? Is Safari being unresponsive? Does doing the same thing in a different browser, like Chrome or Firefox, produce the same problem? You usually only see numbers that high with stuck processes or really processor-heavy applications--not Safari.
    Aluminum Unibody MacBook, Mac OS X (10.5.8)
  • esmith147 Calculating status...
    I'm having the exact same problem. I'll just be on a website and it will turn off automatically. It then will not restart unless I plug it in. It normally does it after using the computer for about half an hour. I noticed the problem first started happening at about 50% capacity, but it keeps getting higher. No it is at about 90-95% capacity when it shuts off. Here is my battery information-

    Battery Information:

    Charge Information:
    Charge remaining (mAh): 2917
    Fully charged: Yes
    Charging: No
    Full charge capacity (mAh): 2926
    Health Information:
    Cycle count: 449
    Condition: Fair
    Battery Installed: Yes
    Amperage (mA): -1061
    Voltage (mV): 12183


    Any advice will be helpful. Thanks.
  • Jay Bullock Level 4 Level 4 (3,800 points)
    Your full capacity is very low and your cycle count is very high. As batteries age and get used, they can start reporting incorrect information to the OS or become unable to handle high loads or rapid changes in power demands.

    In short, time for a new battery.
    Aluminum Unibody MacBook, Mac OS X (10.5.8)
  • esmith147 Level 1 Level 1 (0 points)
    If I have additional applecare service will a new battery be covered? I've only had my computer for a little over a year, so the computers still under warranty/
  • Jay Bullock Level 4 Level 4 (3,800 points)
    Apple generally only warrants batteries up to about 300 cycles.

    But here's a clue as to what might be going on: You say you've had the computer a little over a year, but you have 450 cycles on your battery. That adds up to more than one full discharge-recharge cycle every single day, which is remarkably high.

    How are you using your MacBook that you have so many cycles in so short a time? Apple recommends using the MacBook plugged in whenever power is available--don't unplug when the battery hits 100%.

    Some reading:
    http://www.apple.com/batteries/
    http://www.apple.com/batteries/notebooks.html
    Aluminum Unibody MacBook, Mac OS X (10.5.8)
  • Matzky Level 1 Level 1 (0 points)
    Are you sure this problem is battery related? Because I've been having similar issues and I have noticed some other posts from the last days that talk about their Mac shutting down unexpectedly, also in conjunction with safari freezing up.

    The only thing that changed in the last couple of days is installing the security update 2010-005, seems coincidentally but none the less worth a further glance.
    Mac OS X (10.5.7)

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