Quick Charge 3.0 is a new technology that allows high levels of current to flow to the battery, charging it faster. Both the device and the charger must be compatible with the same voltages and currents to work in the most efficient way.

However, it is possible to charge an older device with a QC 3.0 charger, but it will charge at a voltage limited by the device itself.

USB-C PD is a USB-C port that supports another fast charging technology called Power Delivery. Like QC 3.0, Power Delivery (PD) allows devices to charge quickly over the USB-C connection. PD starts at the 5V setting and can vary up to 20V depending on the requirements of the device it is charging. Interestingly, if two phones that support PD are connected with a USB-C charging cable, one device could charge the other, with no additional power supply needed!.