4 ms·

You can even charge a MacBook from another MacBook if you happen to find yourself in a situation where you forgot the power adapter but not a USB-C cable.

• iakov 3y ago
  How do the devices negotiate who gives the charge and who gets charged? I’ve never tried it - I imagined it wont work at all!
  • jon-wood 3y ago
    I have no idea, but the device that was plugged into mains power was very happy to pass some of it on to my laptop.