USB Power Delivery (USB PD) provides the rules for generating power using USB-C cables, which have the extra wire over which USB PD communicates. USB PD defines five levels as follows. For example, a USB port rated at 50 watts supports 3 amps at 5, 9 and 15 volts, as well as 2.5 amps at 20 volts (50 divided by 20). See USB power, USB Type C and PoweredUSB.

**Power Delivery Battery Logos**

POWER DELIVERY RULESMaximum Amps atRating these voltages:(Watts) 5v 9v 15v 20v.5 =< x =< 15 x/5A 15 =< x =< 27 3A x/9A 27 =< x =< 45 3A 3A x/15A 45 =< x =< 60 3A 3A 3A x/20A 60 =< x => 100 3A 3A 3A x/20A** ** Requires 5A cable

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