Will an older 85w magsafe work with a 13" MBP

Discussion in 'MacBook Pro' started by kmarketing, Sep 26, 2010.

  1. kmarketing macrumors 6502

    Joined:
    Mar 26, 2004
    #1
    Hi,

    I have an older 85w magsafe charger/adapter that I used as a spare with my older 2007 MBP that I no longer have. Can I use that charger with a 2009 Unibody 13" MBP that came with a 60w charger?

    I just want to make sure I don't do any damage to the battery or the MBP.

    Thanks!
     
  2. Intell macrumors P6

    Intell

    Joined:
    Jan 24, 2010
    Location:
    Inside
    #2
    It will work fine and not damage the Macbook in any way.
     
  3. WardC macrumors 68030

    WardC

    Joined:
    Oct 17, 2007
    Location:
    Fort Worth, TX
    #3
    But you can't use a 60W charger with a MacBook Pro that requires an 85W charger. It won't work this way around.
     
  4. Intell macrumors P6

    Intell

    Joined:
    Jan 24, 2010
    Location:
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    #4
    It'll work, the Macbook may not run at full speed or charge it's battery without sleeping.
     
  5. WardC macrumors 68030

    WardC

    Joined:
    Oct 17, 2007
    Location:
    Fort Worth, TX
    #5
    I accidentally bought the wrong charger for my 2.4GHz Santa Rosa MacBook Pro (my older charger had frayed), and the charger that they sent me wouldn't work, the indicator light (the green light on the charger) was a very very dim faint light and it wasn't charging, it would not boot if I took the battery out and tried to power the unit from the charger.
     
  6. PhelpsiPhan macrumors 6502

    PhelpsiPhan

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    Dec 31, 2009
    Location:
    New Jersey
    #6
    I wouldnt recommend using the wrong charger, as this can cause long term battery problems
     
  7. AlphaDogg macrumors 68040

    AlphaDogg

    Joined:
    May 20, 2010
    Location:
    Boulder, CO
    #7
    WRONG-O... The MBP will only draw the current it needs. If there is a 25w excess, then there is a 25w excess... No big deal.
     
  8. WardC macrumors 68030

    WardC

    Joined:
    Oct 17, 2007
    Location:
    Fort Worth, TX
    #8
    Yeah, but if you are using too LOW a voltage charger with a MacBook Pro that requires the HIGHER 85w charger, it won't work right, that's what I was saying.
     
  9. AlphaDogg macrumors 68040

    AlphaDogg

    Joined:
    May 20, 2010
    Location:
    Boulder, CO
    #9
    Yes, that is true... But, I was not quoting you...
     
  10. johnnymg macrumors 65816

    johnnymg

    Joined:
    Nov 16, 2008
    #10
    I use several different power level chargers on both my 13" MBP and 15" MBP and have never seen any difference in operation.

    YMMV
    JohnG
     
  11. jlc1978 macrumors 68000

    jlc1978

    Joined:
    Aug 14, 2009
    #11
    But the 65w charger is still a 16.5 V charger (which is the low end of teh 85W spec)- just lower amperage. It'll work just fine with MBP; I use one on a regular basis.

    Depending on the current draw it may take a bit longer to charge than an 85W.

    Would I buy one instead of an 85? No, but I had a spare from my MB so I use it at home.
     
  12. Macmel macrumors 6502

    Joined:
    Feb 7, 2008
    #12
    It does work. I have tested that myself. The problem is that it hardly provides energy for the MBP to keep working, so It won't charge the battery if you are working with it at the same time, but you can put it to sleep and it will.
     

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