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How to charge your iPhone from your laptop battery.

usb

Here is how to charge your iPhone from your MacBook Air battery. (It  will work for a MacBook Pro as well.)

  1.  Plug the phone into the MacBook Air USB port.
  2.  Open the lid and power up the MacBook Air.
  3.  Close the lid, putting the MacBook Air to sleep and the iPhone  will continue to charge!