I was lucky enough to try out the Aukey PB-Y13.
Overview: It charges my Cellphone and Nintendo Switch with no problems.
Battery Capacity: 10000mAh / 37Wh
Charging Time: 4 hours (with 18W USB PD charger & USB-C to C cable)
Micro-USB Input: DC 5V 2A
USB-C Input (PD): DC 5V 1.5A, 9V 2A
USB-C Output (PD): DC 5V 3A, 9V 2A, 12V 1.5A
USB Output 1 (Qualcomm Quick Charge 3.0): DC 5V–6V 3A, 6V–9V 2A, 9V–12V 1.5A
USB Output 2 : DC 5V 2.4A
Total Power Output: 18W
-instant on (once I plug a device in it starts charging.
-powerful (able to charge phone twice on one charge)
I see no Cons with this battery bank.
Other items for note:
Package Contents: Power Bank, USB-A to C Cable, User Manual, 24-Month Product Replacement Warranty Card