how to test the power output of a usb cable?

I have a usb powered cup warmer. It has a car adaptor. I would like to know if its possible to use it to charge my cellphone in the car, instead of buying a car adaptor.

Answer:

The max power you can draw from a USB port is 2.5W (500 mA at 5V)

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how to test the power output of a usb cable?

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