Can I use this cable to charge my new 12" Macbook? If so, are their any restrictions on the power source (the USB-A side)? Does it need to be 29W?

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    Yes, I've used it to successfully but slowly charge 2015 and 2016 12" MacBooks, and also a new non-touchbar 13" MacBook Pro, from 5W, 10W, and 12W Apple USB-A chargers, as well as various USB ports on cars, planes, and hotel charging lamps.

    Very nice to have a super small and light 12W charger that has USB-A on one end and USB-C on the other... can also very conveniently use that cable to charge the MacBook (Pro) from any USB port, but that's going to be very slow in most cases.

    I had a bit of concern about using such a lower-powered charger at first, but an engineer colleague said if anything, using a lower-wattage charger is good for the MacBook's battery as a slow charge is easier on the cells. Of course, you won't get much charging done (if any) while using the MacBook if plugged into such a low-power charger.

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  • It doesn't need to be 29W. 12,15 and 18W will do except they will charge slower. USB C has the latest in fast charging technology so spend a little more for a much better cable and charger.

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