Apple 60W MagSafe Power Adaptor (for MacBook and 13-inch MacBook Pro)

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Can I use an 85W magsafe power adapter to safely charge my MacBook Air?

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    This KB article states that you can use higher levels with a lower requirement. Note you cannot use lower with a higer.

    So a 85W charger (MBP 15/17) will charge a 45W device (Mac Air)
    But a 45W charge (MBA) will not charge a 60W or 85W device

    support dot apple dot com /kb/ht2346

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