The USB Type-C port on the Anker PowerCore 20100mAh Nintendo Switch Edition PD Portable Charger allows own charging up to 22.5 watts through USB Power Delivery 2.0 technology. When charged using the Apple 29W USB-C Power Adapter, we observed entire charging to complete in about 213 minutes.
The Anker PowerCore 20100mAh Nintendo Switch Edition PD Portable Charger was fully discharged upon plugin to the Apple 29W USB-C Power Adapter over USB Type-C. The Anker charger immediately pulled current to around 1.8 amps at starting voltage of about 14.5 volts to initially charge at around 26 watts. Subsequent charging also happened at about the same 26 watts (14.5 volts @ 1.8 amps) of steady state power over a duration of 152 minutes. After that the current started to ramp down to about 0.4 amps in the last few minutes before dropping to near zero when reaching full charge on the battery. Click here to download the trace captured by the GRL-A1 power analyzer to see more details on the entire charging cycle.
The Apple 29W adapter can be a decent USB Power Delivery charging option for the non Apple based Anker charger despite a longer duration of over 3 hours needed for a full charge.