Power Supply Question

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

  1. KlytusLord macrumors regular

    Apr 11, 2011
    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.

  2. MrCheeto macrumors 68030


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

    Aug 15, 2011
    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


    Jul 9, 2008
    Okie land
    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

    Jul 10, 2010
    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

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


    Nov 2, 2008
    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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