I can feed my Macbook Pro 2011 usb port

Is it possible to power (charge) my MacBook Pro 2011 USB port?  I had the case where I forgot my card (or used my MacBook more than expected) and he should be charged.  Since normally the USB provides power, I didn't connect it to a power outlet (via adapter).

I am running OSX El Capitan.

Thank you

N ° USB came out only one power supply.

Ciao.

Tags: Notebooks

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