rMBP Battery Decreases during Gameplay?

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

  1. mattonthemoon macrumors regular


    Feb 25, 2007
    Toronto, ON
    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?

  2. Intell macrumors P6


    Jan 24, 2010
    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 604


    Dec 11, 2008
    Land of the Unexpected
    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

    Jun 19, 2012
    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


    May 16, 2008
    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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