Calibrated Battery, but..

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

  1. bLaZ3n macrumors regular

    Jul 9, 2010
    I followed the instructions on this page:

    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


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


    Sep 7, 2008
    forlod bygningen
    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
  4. bLaZ3n thread starter macrumors regular

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

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


    Sep 7, 2008
    forlod bygningen
    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:

    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

    Jun 3, 2007
    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

    Apr 7, 2010
    London, UK
    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


    Jun 5, 2010
    Northern California
    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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