Question: UBC-C to Lightning Cable w/Macbook Pro and iPhone 8

Discussion in 'MacBook Pro' started by bbowser12, Oct 5, 2017.

  1. bbowser12 macrumors member

    Jun 18, 2017
    I know if it is plugged directly into the power adapter, you will get fast charging. But...

    Does the usb-c to lightning cable, when plugged directly into a MacBook Pro (w/usb-c), charge the iPhone 8 any faster than the standard charging cable?

  2. bbowser12 thread starter macrumors member

    Jun 18, 2017
  3. Böhme417 macrumors 6502a

    Mar 11, 2009
    I'd like to know as well. Their absurd pricing and lack of third-party cables for USB-C to lightning have stopped me from picking one up.
  4. New_Mac_Smell macrumors 68000


    Oct 17, 2016
    I grabbed a 'Refurbished' USB-C -> Lightning ages ago, was £10. Pretty sure it's just an open box as refurbishing a cable? Anyway, cheap enough not to really complain about...

    A look on Apple's website shows this:

    Charging devices

    Thunderbolt 3 ports can also supply power to attached devices.

    MacBook Pro (15-inch, 2016) and MacBook (13-inch, 2016, Four Thunderbolt 3 Ports) can power two devices that use up to 15 watts, and two more devices that use up to 7.5 watts. It doesn't matter which side of your MacBook Pro that they're connected to—power is delivered on a first-come, first-served basis.

    MacBook Pro (13-inch, 2016, Two Thunderbolt 3 Ports) can power one device that uses up to 15 watts and one device that uses up to 7.5 watts.

    So it can provide 15w. Which makes sense considering it's connected to a power supply, which is supposed to be being used to power the computer not pass through the charging port. You can however plug your device straight into the power adapter to receive the 'fast charge'.

    As for buying another adapter, these work and really aren't expensive.

    It's worth noting that there isn't really any significant gain from using a higher wattage adapter though. 5w is definitely slower, but the difference between 12w -> 29w is marginal considering if you were going to carry around a second adapter. 18w appears to be the 'sweet spot', with 12w being ample if you were already carrying an iPad charger with you. However, the 15w provided through the MBP is right between these and considering you wouldn't need to carry another charger with you, you'd likely find the benefit of just spending the £10 on the cable...
  5. bbowser12 thread starter macrumors member

    Jun 18, 2017
    Thank you so much for taking the time to point this out. Much appreciated. This could be marketing material for those with MBP and iPhone 8/X. I guess it would cut into their sales of 29W chargers though.

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4 October 5, 2017