Calibrated Battery, but..

Discussion in 'MacBook Pro' started by bLaZ3n, Oct 3, 2010.

  1. bLaZ3n macrumors regular

    Joined:
    Jul 9, 2010
    #1
    I followed the instructions on this page: http://support.apple.com/kb/HT1490

    I charged my battery back to 100% and it now says it only has ~6 hours remaining? :confused:

    As it goes down 1% it bounces between ~4 hours, ~5 hours, etc.. what is wrong?
     
  2. miles01110 macrumors Core

    miles01110

    Joined:
    Jul 24, 2006
    Location:
    The Ivory Tower (I'm not coming down)
  3. spinnerlys Guest

    spinnerlys

    Joined:
    Sep 7, 2008
    Location:
    forlod bygningen
    #3
    As miles hinted at the possibility of CPU usage affecting battery life/time, maybe have a look at Activity Monitor ( Applications / Utilities / ) and select All Processes and sort by CPU to see what the culprit may be.

    image below uses sorting by CPU as an example
    [​IMG]
     
  4. bLaZ3n thread starter macrumors regular

    Joined:
    Jul 9, 2010
    #4
    Isn't the battery supposed to last: "Built-in battery (8-9 hour)"
     
  5. hsenor macrumors newbie

    Joined:
    Aug 10, 2010
    #5
    If you turn your screen brightness down the battery lasts longer.
     
  6. spinnerlys Guest

    spinnerlys

    Joined:
    Sep 7, 2008
    Location:
    forlod bygningen
    #6
    Yes, it is supposed to last 8 to 9 hours, but that depends on CPU usage and screen brightness.

    Look at the fine print of the MBP page Apple provides.
    read on: http://www.apple.com/macbookpro/specs.html


    Btw, a game or HD movie or Flash use more CPU cycles, thus more power is drawn from the battery, thus the battery is used quicker.
    Btw 2, using the display at level 1 (out of 16) brightness will give you longer battery life than running it at level 16.

    PS: Did you take a look at this?


    Will this become on of those running in circle threads?
     
  7. movieboy23 macrumors regular

    Joined:
    Jun 3, 2007
    #7
    Oh boy. Have you ever heard of false advertising? With Apple's newest generation of Macbook Pro, most independent reviewers have found that the battery should typically last around 5:45-6:00 under normal use with the screen brightness turned about 1/3 - 1/2 way down and without using the superdrive.

    To get 8-9 hours on the MBP, you'd have to turn off all the radios, keep the screen brightness WAY down and only be working with applications that don't strain the processor much, like iWork of MS Office.

    Disappointing, I know, but it's still better than the competition.
     
  8. bigjobby macrumors 65816

    Joined:
    Apr 7, 2010
    Location:
    London, UK
    #8
    Your battery life depends on what apps you're running so the 'time remaining' would fluctuate accordingly.

    Edit: ... amongst other things. :)
     
  9. DisneyRicky macrumors regular

    DisneyRicky

    Joined:
    Jun 5, 2010
    Location:
    Northern California
    #9
    Screen Brightness, CPU Load, and Wifi all affect it.

    When I'm not using the wifi (or it's not available) I turn off AirPort, and I always keep my bluetooth off.
     

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