Powering a large device (like a Macbook) from USB-A port

Hi,Recently we've been asked again if you can run a Macbook Pro from a USB-A battery.  The kind that powers Phones.Here's what we said:You can only use batteries that have high power output, like 16-20vdc and about 4amps.It is impossible to Power the Magsafe Macbooks from USB.  It's like asking a motorcycle engine to pull a Semi-truck.In technical terms, USB is only 5v, and max at 3a.  That's
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