How does the battery drain...

Discussion in 'MacBook Pro' started by mike 2011, Apr 16, 2011.

  1. mike 2011 macrumors newbie

    Feb 24, 2011
    with respect to having an external device that pulls power, say, from the USB port? Does the device pull energy from the battery, and then the battery is resupplied from the adapter? Or is the juice going straight from the adapter to the device? I'm just curious if having an external device, such as a cooling base with USB powered fans, places undue stress on the battery when the adapter is plugged in.
  2. ViciousShadow21 macrumors 68020


    Mar 11, 2009
    To your left or right
    no, it will not put the battery under any undue stress.
  3. vincenz macrumors 601


    Oct 20, 2008
    No it wouldn't stress the battery at all. They wouldn't design laptop computers to work like that; it wouldn't make sense.
  4. GGJstudios macrumors Westmere


    May 16, 2008

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