Can I use an 85W MagSafe adapter on my 2010 Air which came with a 35W adapter
Can I use an 85W MagSafe adapter on my 2010 Air which came with a 35W adapter?
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If the connections match, sure. But only if they do in fact actually match.
The excess capacity of the 85W charger will simply go unused as your Mac will likely never demand the greater power capability.