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I was try and my macbook can charger with ipad charger (i see output 5.2v-2.4a) with usb A to C convert.

But when i read on my macbook charger, it is have 2 output : 14.5v-2.0a and 5.2v-2.4a

my macbook can charge in 2 mode (both 14.5 and 5.2) or only with 5.2v? if only need 5.2v , why need 14.5v output ?

maybe i use ipad charger on along time, it is what problem ?

marked as duplicate by fsb, Allan, Ɱark Ƭ, grg Mar 10 '18 at 11:07

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The iPad charger will take approximately 3x longer to charge than using the standard charger, if your numbers are correct. This may not be fast enough to charge the laptop while you are using it, depending on how much energy it needs.

Try leaving the laptop plugged in while you aren't using it. You can also access the Activity Monitor and go to the Energy tab to get an estimate on how long it will take to charge from the AC.

It is also possible the USB A to C converter you have only supports data transfer and not charging.

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