it’s been more than six years since Apple first introduced Mag Safe, the magnetically-attaching power connectors used by all of the company’s laptops. Well, almost all.
If you pick up a new next-generation Mac Book Pro with Retina display or a new MacBook Air, you’ll note that those laptops now sport a slimmer version of the Mag Safe adapter—a technology Apple has dubbed Mag Safe 2. (I guess “The New Mag Safe” wasn’t available.)
The advantage of Mag Safe 2 over the original Mag Safe is simply its slimness: It’s easier to fit the new, slimmer port into very thin Mac laptops.
The Mac Book Air uses a 45W Mag Safe 2 adapter; the Mac Book Pro with Retina display uses an 85W Mag Safe 2 adapter. If history is a guide, you can mix and match those Mag Safe 2 adapters, but the lower-powered one will take longer to charge the Mac Book Pro. The 85W one can’t charge a Mac Book Air any faster, either.
And you don’t need to throw away your old Mag Safe adapters yet. The tiny, $10 Mag Safe to Mag Safe 2 Converter lets you use your old power brick with your new laptop.
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