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Battery Discharging during use of Skype On Charger!?

803 Views 8 Replies Latest reply: Nov 9, 2011 12:07 PM by alin0steglinski RSS
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Nov 9, 2011 11:10 AM

Screen Shot 2011-11-09 at 11.40.58 AM.jpg


Calling all battery & Power experts.


Skype and earlier builds aside from classic 2.8 build which does not support lion screen sharing nor does it support automatic camera start are causing my fans to kick on high and causing excessive CPU usage. OK all that is already established, Skype is crap from microcrap, we all know that. BUT this is the killer for me, in the last week or two, I noticed something FAILED hardware wise. I kind of want to blame my charger, but maybe the logic board or battery. My mac is DISCHARGING albeit slowly while I have skype running with a video call on it, only way for me to stop this is to end the video on my end, seeing the other persons video is fine but when I turn mine on fans kick on CPU gets killed. Can someone explain to me though why it would start causing this kind of issue?



MacBook Pro 15, Mac OS X (10.7)
  • Allan Jones Level 7 Level 7 (29,605 points)

    Unusual but not unexpected.


    This Apple article has a subtle bit of wording that probably explains what you see:



    specifically this:


    If the battery is removed from a MacBook or MacBook Pro, the computer will automatically reduce the processor speed. This prevents the computer from shutting down if it demands more power than the A/C adaptor alone can provide.


    (my emphasis)


    This seems to say Apple anticipated some very demanding apps would need extra power, requiring the battery to supplement the A/C source.


    The fact that your fans spin up supports your observation about the app being a kludge-hog.

  • eww Level 9 Level 9 (52,975 points)

    Skype video calling is a monstrous energy hog, and when you do it, your MBP is demanding more power than its AC adapter can provide. Under those conditions, the battery is drawn upon to make up the power deficit. This is by design, and is the way the machine is supposed to operate.


    To limit the impact of Skype video calling, you can either a) not do it, which is what I recommend, or b) make sure nothing else is drawing power at the same time: no bus-powered peripheral devices connected (hard drives, iPhones, iPods, iPads, mice, trackpads, joysticks, etc), no other apps running, and no power-hungry background processes eating up processor cycles.

  • eww Level 9 Level 9 (52,975 points)

    You may want to try resetting the SMC:



    Doing so can sometimes sort out power-related anomalies.


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