HT201700: Find the right power adapter and cord for your Mac notebook
Learn about Find the right power adapter and cord for your Mac notebook
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Helpful answers
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Jun 4, 2012 3:10 PM in response to Aldebaran Borealisby SP Forsythe,A) Apple has indicated that all three adapters are perfectly suitable for the MBA. You can use one of the MagSafe adapters that is larger than yours, just not smaller. Hence the Air is more or less going to be universally OK with all the adapters.
B) I use my 85 watt adapter on my Air approximately 95% of the time, and the 45 watt adapter maybe 5% of the time with absolutely no problem. The reason is that I want to have only one adapter on my desk, and not worry about anything. The 45 watt is packed away in my MBA travel bag.
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Jun 4, 2012 3:15 PM in response to Aldebaran Borealisby JasonFear,Hello Aldebaran,
I used the charger for a 15" MBP on an 11" MBA in a pinch for a week long in the field seminar when my 11" MBA power brick failed. There was no damage/harm to the machine during that week of use. The bigger issues that occur is when you role reverse (trying to charge a 15" with an 11" charger). More often then not, especially if the machine is under load the power adapter can't move enough to juice to power the machine and it'll begin to drain the battery.