Temps lower when not charging...

Discussion in 'MacBook Pro' started by clickclickw00t, Jun 3, 2011.

  1. clickclickw00t macrumors regular

    Joined:
    Jun 28, 2007
    #1
    So I noticed my MBP runs about 4C cooler when it's running off battery than while charging. Probably the heat from the excess energy, but it's still a lot. Maybe something for you people using them on your lap all the time?
     
  2. saberahul macrumors 68040

    Joined:
    Nov 6, 2008
    Location:
    USA
    #2
    Perfectly normal and yes it is due to the dissipated heat from the charge cycle taking place while the connector is plugged in. I doubt 4C will make much difference to someones lap but it is a valid point.
     
  3. sjinsjca macrumors 68000

    sjinsjca

    Joined:
    Oct 30, 2008
    #3
    What he said.

    Charging takes current makes heat.

    PLUS when your machine is disconnected from mains power, the CPU, hard disk and backlight are nicked down a notch to enhance battery life. There may be other economies coming into play, too: maybe WiFi power, perhaps GPU mode (depending on your model), etc etc.

    I'm mildly surprised the difference isn't greater than 4C.
     

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