Every USB‑C cable must support at least 3 amps of current and up to 20 volts for up to 60 wats of power according to the USB PD specification. Cables were also allowed to support up to 5 A while retaining the 20 V limit, allowing up to 100 W of power; however, the 20 V limit for 5 A cables has been deprecated in favor of 48 V. The combination of higher voltage support and 5 A current support is called Extended Power Range (EPR) and allows for up to 240 W (48 V, 5 A) of power according to the USB PD specification.”

Dakle za puniti 5V ( većinu uređaja sa USB A i C ) se koriste naponi do 20V pa da je pad napona i 10V  i dalje će se istom brzinom (mAh) puniti baterije uređaja . Regulacija struje punjenja nije u punjaču već u uređaju npr. mobitel. Za punjenje jačih uređaja (laptop, power pack baterija itd.) napon punjača može biti i do 48V.