85w magsafe with 13" MacBook Air?

Discussion in 'MacBook Pro' started by Bez59, Nov 10, 2012.

  1. Bez59 macrumors regular

    Joined:
    May 18, 2012
    Location:
    Derbyshire, England
    #1
    Hi, Am i right in thinking that it is ok to use the 85w Magsafe from my 15" MacBook Pro with a 13" 2010 MacBook Air?
     
  2. Soundcheck macrumors newbie

    Joined:
    Oct 27, 2012
    #2

    Yes you are. The computer will only take as much Watt that it needs.
    So it's always OK to use a "stronger" charger. But not the other way.
     
  3. Bez59 thread starter macrumors regular

    Joined:
    May 18, 2012
    Location:
    Derbyshire, England
    #3
    Thank you.
     
  4. bobcan macrumors 6502a

    bobcan

    Joined:
    Jan 8, 2007
    Location:
    Sunny but Cold.. Canada
    #4
    Yup.. You're Good!!

    YES indeed, 'Soundcheck' is correct..

    The Voltage Output is the same, and the Amperage 'draw' that a larger machine requires may put an adverse stress on a Smaller Sized Charger.. my 2011 15" MBP Adaptor already gets Very Warm some days, so I certainly wouldn't want to see it 'work any harder'..

    So, Just DO It!! ;)
     
  5. snaky69 macrumors 603

    Joined:
    Mar 14, 2008
    #5
    The smaller wattage charger will work, they will charge much slower and run hotter.

    Also, the computer may actually discharge while being plugged in if it is being used to it's full potential, say by gaming.
     
  6. mrsir2009 macrumors 604

    mrsir2009

    Joined:
    Sep 17, 2009
    Location:
    Melbourne, Australia
    #6
    No, it's ok to use a weaker changer too - It just charges slower.
     
  7. calderone macrumors 68040

    calderone

    Joined:
    Aug 28, 2009
    Location:
    Seattle
    #7
    Negative. Using a lower wattage charger can cause SMC issues. In addition, if the computer is under sufficient load it may not charge at all, instead the power is being used to supply the computer not the battery.

    It is inadvisable to use a charger outputting lower wattage than the default charger.

    http://support.apple.com/kb/HT2346
     
  8. mrsir2009 macrumors 604

    mrsir2009

    Joined:
    Sep 17, 2009
    Location:
    Melbourne, Australia
    #8
    Oops :eek:
     

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