Is it ok to use a MacBook Pro 60watt magsafe?

Discussion in 'MacBook Air' started by still in school, Jul 31, 2011.

  1. still in school macrumors 6502

    Feb 21, 2009
    My sister has a 13" MacBook Pro. Is it safe to use her charger to charge my MBA? From my understanding, the MBA would only draw as much power as it can take. So in theory, it should be safe. Correct?
  2. brand macrumors 601


    Oct 3, 2006
    You can use any model of the MagSafe power adapters to both power and charge your MBA.
  3. TEG macrumors 604


    Jan 21, 2002
    Langley, Washington
    Any Magsafe adapter will operate any MacBook model, the change will only effect battery charging speed.
  4. VMMan macrumors 6502a

    Mar 29, 2009
    I've read online that it's supposedly okay to use any MagSafe adapter that's greater (and not less) the wattage for your Apple laptop, but is it IDEAL?

    I mean, is there any benefit to using only the 45W adapter for your MBA vs using your MBP 17" 85W adapter?

    Otherwise, if you have both MBPs and MBAs, wouldn't you want to just buy the highest wattage adapter to take care of all your charging needs? (assuming you don't care about the slightly smaller size of the different adapters).
  5. still in school thread starter macrumors 6502

    Feb 21, 2009
    Thanks guys, it's good to know. I just didn't want my brand spanking new MBA to blow up.
  6. KPOM macrumors G5

    Oct 23, 2010
    Apple advises against using a 45W adapter on a Mac that was equipped with a 60W or 85W adapter because the battery might discharge faster than the 45W charger can recharge it, but they say it is fine to use a 60W or 85W adapter on a 45W Air. The charger will adapt to the requirements of the battery. I'm guessing size and cost are the main reasons they ship a 45W adapter with the Air rather than standardize on one wattage.
  7. Paul830 macrumors newbie

    Jul 26, 2011
    Why did Apple make the MagSafe plug the same on all adapters? I have a new MacBook Air and a 2008 15" MacBook Pro they have the same MagSafe plug... The transformers are under my desk... Until I marked one with a red dot I was always grabbing the wrong power cord. It seems to me that if there is a problem interchanging the adapters between apple products, then Apple should have marked the plugs with the wattage or in some way that the user can easily tell them apart.
  8. jdechko, Aug 12, 2011
    Last edited: Aug 12, 2011

    jdechko macrumors 68040

    Jul 1, 2004
    If I recall correctly, the 45W for the Air is a good bit smaller than the 85W for the Pro. The 60W would fall somewhere in between. Also, newer adapters seem to be labeled as well.
  9. Detrius macrumors 68000

    Sep 10, 2008
    Asheville, NC
    ...or it may just make it flat out impossible to charge the battery. I just recently had a customer who was using the 45watt charger on an older MacBook. The battery was so dead (9V) that we had to reset the SMC to get the thing to turn on when it got here.

    You should never use a power supply of any kind on any device that asks for more than the power supply is capable of providing.
  10. GekkePrutser macrumors 6502a


    Aug 18, 2005
    Apple says yes:

  11. Tommeh macrumors member

    Jan 28, 2009
    Using one with more power is no problem indeed, that's why the Cinema Display has a 85W charger built in. It works with al Macbook's.
  12. tshort macrumors regular

    Jul 20, 2007
    I have one of each size...

    The 45W one for the fiancee's MBA has the right-angle plug, so we can tell the difference.

    The 60W one is near my bed for my 13" MBP.

    The (spare) 85W one is in the living room near the couch, I use it for my 13" and (work) 15" MBPs.

    I don't use my work 15" MBP in bed, so I just know where they are and I'm good.

    The ones with more power work fine.
  13. bniu macrumors 6502a

    Mar 21, 2010
    If you're going to have MagSafe adapters plugged permanently into hard to reach places, then u outta just buy 1-2 85W adapters and leave them there. That's what I do, no need to care which MacBook I'm plugging into it because it will charge it fine.

Share This Page