What is the difference between the two power adapters?

45W and 85w cost is same description the same....what's the difference?!!!!

Apple 85W MagSafe 2 Power Adapter (for MacBook Pro with Retina display)

Apple 85W MagSafe 2 Power Adapter (for MacBook Pro with Retina display)

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3 Answers from the Community

  • Best Answer:

    Size and compatibility.The 85w is larger/heavier than the 45w. The 85w will adapt to be used with a lower power computer (ie. the MacBook Air), but it was intended for use with the MacBook Pro with Retina Display.

  • The 45W is meant for the MacBook Air and the 85W is for the MacBook Pro with Retina Display. The built-in 95-watt-hour battery in the Pro and the 50 in the Air each have different chargers.

  • 45W is for the New Macbook Air, and the 85W is for the Macbook Pro (Retina)