I've patiently tried several.? Once negotiated the quality or not of? the? 9V? 15V etc is from the wall charger supply and as good as that is
Problems? ?The cable may output any available 'lower than requested' voltage if the wall charger socket negotiation fails or the wall charger socket doesn't do that particular nominal voltage.
e.g. I have a 20V trigger cable that gives 15V if plugged into one USB-C on my dual charger and 20V on the other (The Port PD capabilities vary) .?
Plug it into an old fashioned wall charger and out pops 5V
This can get confusing so do I end up tying the right cable to the right charger?? ?I'd rather buy a dedicated supply . .
Bruce Akhurst