rMBP Battery Decreases during Gameplay?

Discussion in 'MacBook Pro' started by mattonthemoon, Jun 27, 2012.

  1. mattonthemoon macrumors regular

    mattonthemoon

    Joined:
    Feb 25, 2007
    Location:
    Toronto, ON
    #1
    First off, i love my rMBP, wouldn't return it for the world.

    But i observed the following and wanted to know if it was normal?

    Played about 2.5 hours of Diablo 3 tonight, power was connected.

    Settings were 2880x1800, all High Settings, Shadows Off, no AA...

    Anyway while playing i noticed my battery charge go from 93% to 90% even though it was plugged in the whole time.

    Is this normal under heavy load?

    Thanks.
     
  2. Intell macrumors P6

    Intell

    Joined:
    Jan 24, 2010
    Location:
    Inside
    #2
    This is normal. If the Magsafe cannot provide enough power, the machine will draw power from the battery as well. This is why on some later Macbooks and Pros that had a removable battery, the performance would be reduced if the battery was removed.
     
  3. Queen6 macrumors 603

    Queen6

    Joined:
    Dec 11, 2008
    Location:
    Putting out the fire with gasoline...
    #3
    Yes, my Late 2011 15" MBP 2.4 i7 does the same under heavy load, all the Quad Cores draw more power than the supply provides, it`s just an Apple thing :apple:
     
  4. TickleMeElmo macrumors regular

    Joined:
    Jun 19, 2012
    #4
    Quad core: 45W
    SSD: 5W
    Chipset: 10W
    GPU: 50W?
    Screen: 30W?

    Magsafe 2: 85W

    The numbers suggest that the power adapter does not provide enough power if you were to run everything at 100%.
     
  5. GGJstudios macrumors Westmere

    GGJstudios

    Joined:
    May 16, 2008
    #5
    Yes. It's normal for your MBP to draw power from both AC and battery during periods of extreme demand, such as gaming or other multimedia operations. This can cause your battery to stop charging or even drain. Read the AC POWER section of the following link. This should answer most, if not all, of your battery questions:
     

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