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3 Hours Remaining, Yet Fully Charged

395 Views 17 Replies Latest reply: Jan 20, 2013 1:46 PM by OGELTHORPE RSS
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sami81 Calculating status...
Currently Being Moderated
Jan 16, 2013 8:30 AM

Hi,

 

I bought my Macbook in the summer, so it's fairly new. I've been very happy with my battery until the past few days. I noticed my Macbook heating up and the battery draining. I let it drain and left it dead for five hours then charged it. Here I am the next day, and it began at 99% and said there was 3 hours and some minutes of lfe in it. It's down to 89% under thirty minutes later, while I'm writing this, and now says it has 2:58.

 

I'm on 10.7.5, by the way. Again, fairly new.

 

Any info anyone can give me? Since it is under 5 months, it's got to be covered, no? Not fair. I spent 1200 bucks thinking this wouldn't give me issues mere months later....

 

 

Thanks for reading.

Mac Pro
  • Courcoul Level 6 Level 6 (11,210 points)
    Currently Being Moderated
    Jan 16, 2013 10:45 AM (in response to sami81)

    This virtually begs for an SMC reset: http://support.apple.com/kb/HT3964

  • OGELTHORPE Level 7 Level 7 (22,905 points)
    Currently Being Moderated
    Jan 16, 2013 10:57 AM (in response to sami81)

    Read the directions again, carefully.  You missed:

     

    Screen Shot 2013-01-16 at 1.51.24 PM.png

    Ciao.

  • OGELTHORPE Level 7 Level 7 (22,905 points)
    Currently Being Moderated
    Jan 20, 2013 11:29 AM (in response to sami81)

    Battery life is a function of what applications that you have open and the stress they place on the CPU/GPU.  In addition, the more stress on the CPU/GPU, the more heat is generated. 

     

    In the real world, if you get 60% - 70% of the Apple advertised figure, you are experiencing realistic battery life.  If you use Skype or play games, battery life will decrease dramatically.  The time left data reflects the load being placed on the electrical system at that given moment and can vary dramatically.  I have little faith in it and monitor the percentile number.

     

    Here are a couple of support articles that you may find helpful:

     

    http://www.apple.com/batteries/notebooks.html

     

    http://support.apple.com/kb/HT1446

     

    It certainly would not hurt to make an appointment at an Apple genius bar and have your MBP checked.

     

    Ciao.

  • OGELTHORPE Level 7 Level 7 (22,905 points)
    Currently Being Moderated
    Jan 20, 2013 11:50 AM (in response to sami81)

    With 50% battery level I would expect more time than 90 minutes in ordinary usage.  However you have provided more information that may be germane to your situation.  I am not familiar with Scrivener and it may or may not nbe a CPU glutton.  What is AVG?

     

    Post an image of Activity Monitor showing 'All Processes' and % CPU set from high to low values.

     

    Screen shot 2013-01-20 at 2.48.11 PM.png

    Ciao.

  • OGELTHORPE Level 7 Level 7 (22,905 points)
    Currently Being Moderated
    Jan 20, 2013 12:40 PM (in response to sami81)

    I think I know why you are experiencing poor battery life.  There seems to be a runaway application.

     

    http://support.apple.com/kb/TS1473

     

    Please repost Activity Monitor and make certain that you have scrolled the applications all the way to the top.  Considering the CPU usage, I feel that there is something missing which is causing this situation.

     

    Ciao.

  • OGELTHORPE Level 7 Level 7 (22,905 points)
    Currently Being Moderated
    Jan 20, 2013 1:34 PM (in response to sami81)

    Things look normal now.  The red in the CPU graphs show that the CPU was being stressed and that causes heat and lessens battery life.  In your case the displayed percentiles may have been comparatively low but the graph told the tale.  So do not be deceived by percentiles in the example that I posted. 

     

    Are you running Windows on your MBP?  If so, that may explain some of your low battery life.

     

    I suggest that you get rid of AVG.  You do not need it.

     

    Try another browser.  Chrome seems to be a CPU glutton compared to other browsers.  I generally use Firefox.

     

    I also operate my MBP on AC power whenever there is an outlet available.  Monthly, if I have not used it with the battery, I will run the battery to the 40% level to keep the battery active.  My goal is to prolong the period of time before replacement is necessary.  If you can do that, good.  If not, well then that is what the battery is for.

     

    Ciao.

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