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Definition: USB power


Drawing power from a USB connection. Launched in 2007, USB Battery Charging was the first USB power specification. Battery Charging was fixed at 7.5 watts, 5 volts and 1.5 amps. See USB Battery Charging and poweredUSB.

USB Power Delivery (USB PD)
In 2012, USB Power Delivery was introduced by the USB Implementer's Forum (USB-IF). USB PD enables charger and receiver to negotiate the required power, which increased from 7.5 to 240 watts by 2021. See also poweredUSB.

     Power Delivery Over USB-C Cables

        Watts   Volts  Amps

          15      5     3
         100     20     5
         240      5     5




PD Battery Logos
These logos indicate that the USB port supports Power Delivery. The numbers are the SuperSpeed version (see USB).