Quick Charge
Quick Charge (QC) is a proprietary Qualcomm battery charging protocol used for managing power delivered over USB, mainly by communicating to the power supply and negotiating a voltage. Quick Charge is supported by devices such as mobile phones which have Qualcomm SOCs, and by some chargers; both device and charger must support QC, otherwise QC charging is not attained. It charges batteries in devices faster than standard USB allows by increasing the voltage, while adopting techniques to prevent the battery damage caused by uncontrolled fast charging. Most chargers supporting Quick Charge 2.0 and later are wall adaptors, but it is implemented on some in-car chargers, and some power banks use it to both receive and deliver charge.
Quick Charge is also used by other manufacturers' proprietary rapid-charging systems.