Indipro D-Tap to Type C-USB Quick Charging Adapter & Power Supply (10")

I've used the TetherTools/ONsite adapter, and I currently have the Jupio PowerHQ and this.

The TetherTools is unidirectional (only does DTAP-to-USB) and is finicky in terms of what devices it will negotiate PD with. I wouldn't use it on a job unless I had a PD meter to verify that it was working, and some backup supply to use if it failed, which means I just didn't use it.

This and the Jupio are reliable (negotiate PD with every device I own within their respective current limitations) and provide bidirectional conversion (DTAP-to-USB and USB-to-DTAP). The IndiPro has two advantages: It can go up to 100W vs 60W for the Jupio, and it can safely fast-charge LiIon batteries over DTAP, while the Jupio only acts as a DC supply.

EDIT: I've also tried charging a range of IndiPro, Smallrig, and Fxlion batteries from 50-150 W*hr with this, using a USB-PD power meter to check the delivered power/current. Both the charging currents and the current "step-downs" look reasonable. It delivers 100W to the larger ones and limits the 50 W*hr batteries to 60W (this is a good thing). It appears to step down by about 1/3 at 80% and then progressively ramps the current down to zero from 90%-100% (again, a good thing unless you really like fires).