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leon44

macrumors 6502
Original poster
Jun 17, 2010
356
175
Newcastle upon Tyne, England
Sorry if this has been asked before, I have a 'Scosche Dual 10 Watt (2.1A) USB Car Charger' for fast charging my iPhone/iPad in the car. Is there any reason why this wouldn't charge a rMB with just a USBA-USBC cable? Or is 2.1A too low?

If anyone can suggest another nice solution to charging in the car let me know :)
 

Gav2k

macrumors G3
Jul 24, 2009
9,216
1,607
It will charge but super slow and certainly not when it's switched on.
 
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BeyondtheTech

macrumors 68020
Jun 20, 2007
2,141
675
Tried this. If you USE your MacBook while it's charging, it will actually not sustain its battery strength, it will drain, albeit more slowly. If you leave it alone, it will charge but take SEVERAL hours to complete the charge. This is the only charger on Amazon that produces the proper output (29W is 14.5V at 2A) to charge at the same speed as the original adapter, but it ships from China in a month from now.

Helper Mini 14.5V 2A 29W Car Charger Car Adapter USB-C for New MacBook Mac Book Retina 12" with 5V 2A USB https://www.amazon.com/dp/B01E47PWEI/ref=cm_sw_r_cp_tai_i7SuxbH59BVB0

Anything charging over a USB-A connection won't produce or shouldn't allow the power that a straight USB-C cable does, as it's not designed for that. Any manufacturer that tells you so is wrong. And any generic USB-C charger still won't produce the wattage for the MacBook, as they're designed to charge newer USB-C smartphones.

Of course, a quicker solution is to get a cheaper inverter so you can simply use your original adapter as if it's plugging into an AC outlet.
 
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leon44

macrumors 6502
Original poster
Jun 17, 2010
356
175
Newcastle upon Tyne, England
Tried this. If you USE your MacBook while it's charging, it will actually not sustain its battery strength, it will drain, albeit more slowly. If you leave it alone, it will charge but take SEVERAL hours to complete the charge. This is the only charger on Amazon that produces the proper output (29W is 14.5V at 2A) to charge at the same speed as the original adapter, but it ships from China in a month from now.

Helper Mini 14.5V 2A 29W Car Charger Car Adapter USB-C for New MacBook Mac Book Retina 12" with 5V 2A USB https://www.amazon.com/dp/B01E47PWEI/ref=cm_sw_r_cp_tai_i7SuxbH59BVB0

Anything charging over a USB-A connection won't produce or shouldn't allow the power that a straight USB-C cable does, as it's not designed for that. Any manufacturer that tells you so is wrong. And any generic USB-C charger still won't produce the wattage for the MacBook, as they're designed to charge newer USB-C smartphones.

Of course, a quicker solution is to get a cheaper inverter so you can simply use your original adapter as if it's plugging into an AC outlet.

Interesting thanks! I think I'm probably going to get an Anker PowerCore Just need to wrap my head around what cables I can and can't use to charge a rMB or charge FROM a rMB...
 
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