Comment by dwaite
3 years ago
The good news is that all functional USB-C cables will generally charge at 30W. They might not be able to go above 30W, they might only have USB 2.0 speeds. The USB-IF has only just now come up with IMHO their first passable attempt at labelling.
However, for a couch or car charger for a phone, just about any cable that is wired correctly should do everything you want.
The problems come with alt modes and fast charging - the cable might not support the full capabilities, or the device itself (points idly at Nintendo Switch and Raspberry Pi 4) might not have shipped as USB-compliant, breaking with certain valid setups.
My opinion, the problem here isn't just cabling but troubleshooting help - how do I know the cable or charger I'm using isn't charging my computer at full speed? And which one is the problem?
All functional USB-C cables will charge at 60W.
Yes. The minimum capability of any USB-C cable is 3A 20V charging (60W), and USB 2.0 480 Mbps data.