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A USB port is usually measured in voltage not wattage.
Most are around 1.5 to 2.5 volts, some are higher but they are usually called fast chargers.
 

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You mean amps, USB is a 5V standard.

One that old is probably only 1A, so 5W.

If you want more, use an adaptor in the 12V power socket.
 
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