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  • Best Answer:

    The fact is that the old 85W MagSafe adapter and the new 85W MagSafe 2 adapter differ in their electrical specifications, not just the connector:

    Old 85W MagSafe adapter:
    Input: 100-240V, 1.5A, 50-60 Hz.
    Output: 16.5 - 18.5V, 4.6A

    New 85W MagSafe 2 adapter:
    Input:100-240V, 1.5A, 50-60 Hz.
    Output: 20V, 4.25A

    We all know now that there is an adapter available to make the connector of the old MagSafe adapter fit the new rMBP, but the real question is what effect the voltage difference will have. Will it work? WIll it charge more slowly? Does the rMBP have internal circuitry that fully compensates? It will take someone with real technical knowledge of the new rMBP to answer this one.

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  • Technically yes, but you need the "MagSafe to MagSafe 2 Converter" which is like 10 dollars on/in the Apple Store.

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  • Yes, but only with a MagSafe to MagSafe 2 Adaptor (On the Apple Store for $9.99).

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  • Yes they will.
    You can use the old magsafe 1 power adapter on a retina macbook if you buy an " Apple MagSafe to MagSafe 2 Converter".

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  • No, previous generation MBP MagSafe power adapters need the MagSafe 1 to MagSafe 2 adapter to charge the new MBP with Retina Display.

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  • Yes, an 85 Watt adapter from a previous mac will work, if you get an Apple MagSafe to MagSafe 2 Converter for $10

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  • There's a converter from MagSafe to MagSafe2 available if you want to use the new MacBook Pro with a Cinema Display. I would say that it works the same if you just use a normal MagSafe.

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  • Yes, if you buy the MagSafe converter, which is only $10.

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  • There is a $9.99 adapter at the Apple Store that will convert an original 85W MagSafe to the 85W Magsafe 2 used for the 15" MacBook Pro with Retina Display.
    Apple Insider has an article about it that you can google to find. It wouldn't let me paste the link.

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  • Apple 85W MagSafe Adapters can be used to charge the New MacBook Pro with retina Display with the MagSafe to MagSafe 2 Converter.

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  • Yep, you'll need the Adaptor though as the MagSafe 2 connectors are smaller.
    Search for MagSafe to MagSafe 2 Converter in the store.

    Hope this helps.

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  • Yes. although, you have to purchase the Magsafe to Magsafe 2 power adapter for $10

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  • I believe it will - but you have to buy the $10 adapter (can't find a link for it).

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  • Yes but you'll need a MagSafe to MagSafe 2 Converter which you can find in the apple store.

    Was this useful? Answer 14

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  • Not without an adapter, which you can buy for $9.99 from the Apple Store. Just search for "MagSafe to MagSafe 2 Converter."

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  • Nope. Although, there's an adaptor for that. "MagSafe to MagSafe 2 Converter"

    Was this useful? Answer 16

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  • Sorry, but that is a negative. However, you can purchase the adapter for "Old" to "New" Magsafe for 10 bucks. The port itself had to be made smaller, since the whole thing is so thin. Its unfortunate, I just bought an adapter 2 weeks ago myself, hopefully I can get into the Apple store to replace it by tomorrow.

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  • No,you must have an adaptor,its a wider port.

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