Quick Charge 4 and 4+: similar to Quick Charge 3.0 but adds support for USB-PD Mode (USB Power Delivery Mode), which is another fast-charging standard. The USB-PD Mode compatible specs of Quick Charge 4 are 5 or 9 Volts and between 3 and 21 Volts for USB-PD 3.0 PPS (Programmable Power Supply) and a maximum of 3 Amperes and 27 Watts. .