Power Supply Question

Discussion in 'MacBook Air' started by KlytusLord, Aug 20, 2011.

  1. KlytusLord macrumors regular

    Joined:
    Apr 11, 2011
    #1
    Hi all,

    Are there any issues with charging a MBA with the MBP's power unit?

    The Air's is slightly smaller, but with my setup it is simplest to just swap the computers using the same power supply.

    Thanks.
     
  2. MrCheeto macrumors 68030

    MrCheeto

    Joined:
    Nov 2, 2008
    #2
    As a rule, if it plugs in without any problem what-so-ever, it will work fine.
     
  3. EthanMiller macrumors member

    Joined:
    Aug 15, 2011
    #3
    The MBP charger will work fine with the Air, but not vice versa. The 45-Watt Air charger can't provide enough for the MBP, but the 60 (or perhaps 80)-Watt MBP charger can provide enough for the MBA, and it can tell the charger not to throw too much at it.

    That information is also on Apple's site if you want to look for it.
     
  4. Cynicalone macrumors 68040

    Cynicalone

    Joined:
    Jul 9, 2008
    Location:
    Okie land
    #4
    It works just fine.

    It's the same concept as the Thunderbolt display it provides 85W maximum and the MacBook Air will just use 45W.
     
  5. AppleTech22 macrumors 6502

    Joined:
    Jul 10, 2010
    Location:
    US
    #5
    Can anyone confirm if the Air simply tells the charger to stay at 45 or can it be charged faster with the 60 or 85?
     
  6. jcg878 macrumors member

    Joined:
    Aug 14, 2011
    #6
    It will not charge any faster. 45W is all it will get. Read here
     
  7. MrCheeto macrumors 68030

    MrCheeto

    Joined:
    Nov 2, 2008
    #7
    Devices draw only as much wattage as they need. That's why you can plug a 40w and 100w bulb into the same socket. Right? Right.
     

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