magsafe power adapters- can I use a more powerful one for a smaller laptop?

Discussion in 'MacBook Pro' started by iansilv, Jan 21, 2009.

  1. iansilv macrumors 6502a

    Joined:
    Jun 2, 2007
    #1
    I am wondering- could I use a 17" macbook pro powerbrick to charge a macbook air or another macbook pro that comes with a lower wattage power adapter? Or would it damage the computer?
     
  2. robbieduncan Moderator emeritus

    robbieduncan

    Joined:
    Jul 24, 2002
    Location:
    London
    #2
    Yes. The power output is maximum: only the required power will be drawn.
     
  3. iansilv thread starter macrumors 6502a

    Joined:
    Jun 2, 2007
    #3
    thank you. So, it would make sense to future proof things, to just buy the largest adapter available if you are buying a second one for travel, right? That way you could use it in the future with anew model, provider the magsafe adapter does not change- and I have no idea why they would change that.

    What about using a lower power one to just charge a notebook? Would it just take longer?
     
  4. robbieduncan Moderator emeritus

    robbieduncan

    Joined:
    Jul 24, 2002
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    London
    #4
    Personally I'd not recommend it, but there are multiple reports of Macbook adaptors working on Macbook Pros without anything exploding!
     
  5. creator2456 macrumors 68000

    creator2456

    Joined:
    Jul 10, 2007
    Location:
    Chicago
    #5
    A couple things could happen.
    1. Nothing will happen and the computer will use battery like normal
    2. No charging, but the battery will not be depleted
    3. Very slow charging
    If the computer was powered down, I would suspect that charging would just take longer.
     
  6. kastenbrust macrumors 68030

    kastenbrust

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    Dec 26, 2008
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    North Korea
    #6
    The charging will go incredibly slow (like 18 - 22 hours for a full recharge) but no other side effects will occur.
     
  7. J the Ninja macrumors 68000

    Joined:
    Jul 14, 2008
    #7
    The normal MagSafe connector doesn't fit in the Air's power plug...or at least I was told that was why they brought out the right angle one.
     
  8. Sauron's Master macrumors regular

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    Dec 24, 2002
    Location:
    Saratoga, CA / New York, NY
    #8
    Please stop spouting nonsense like you always do.
     
  9. creator2456 macrumors 68000

    creator2456

    Joined:
    Jul 10, 2007
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    Chicago
    #9
    It will fit just fine. The MBA just can't be on a flat surface. So if you hang the edge with the magsafe off the edge of a table, any magsafe will plug in.
     
  10. neilhart macrumors 6502

    neilhart

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    Oct 11, 2007
    Location:
    SF Bay Area - Fremont
    #10
    The answer is yes you can and it will not damage your MBA.

    Neil
     
  11. Kleivonen macrumors member

    Joined:
    Jun 3, 2008
    #11
    I've had a Polycarbonate's Charger charge my Early '08 MPB with no issues.
     
  12. Migsy macrumors newbie

    Joined:
    Jan 19, 2009
    Location:
    London, UK
    #12
    That is exactly what they have done with the 24" Cinema Display - they have stuck a powerful charger in there so it can handle any current and future magsafe laptop's power requirements.
     
  13. NATO macrumors 68000

    NATO

    Joined:
    Feb 14, 2005
    Location:
    Northern Ireland
    #13
    +1

    I use my MacBook Pro charger with my MacBook Air out of convenience, I just have to have it sitting at the edge of my desk but it charges fine.
     
  14. SFStateStudent macrumors 604

    SFStateStudent

    Joined:
    Aug 28, 2007
    Location:
    San Francisco California, USA
    #14
    For whatever reason, my MBAir 45W magSafe adapter won't startup my MBP 2.5GHz which requires the 85W magSafe adapter; then again my battery is bad on the MBP...
     

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