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MagSafe to MagSafe2 & rMBP - Does it charge the rMBP while in use?

Equipment: 2012 rMBP, 2008 23" Cinema Dislay, MagSafe to MagSafe2 adapter.

Tonight I hooked up my retina macbook pro to my cinema display via the MagSafe to MagSafe2 adapter and noticed that while the rMBP received power, it wasn't charging the battery while I used the computer.

I've read various reports online about the MacBook air being able to receive both power and battery charge simultaneously, probably because it's power needs are 45w compared to the rMBP's 85w.

My experience so far says that the MagSafe to MagSafe2 adapter will NOT charge a rMBP while it's in use. Is this correct?

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1 Answer from the Community

  • Best Answer

    I am not a Genious Bar Apple employee but I do own a 13" MacBook Air, the 13" MacBook (Mid 2005), 15 inch MacBook Pro (Mid 2008), 13" Macbook Pro (Mid 2011) and two White mid 2006 MacBooks-- Just to name a few

    The air requires 45 watts, MacBooks require 60, and the 15"/17" Pro's require 85 watts.

    Summary:
    45w Megsafe Air charger will only charge the Air although a higher watt charger will charge it as well

    60 Watt Mega safe. Charger that comes with the all 13" MacBook's and Pros are as well as the air

    Whilst the The 85 watt Megasafe charger is intended For Macs 15" & 17"; it is my charger of choice b/c it charges all Intell based Macs including the air

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