I bought this item from Amazon almost 1 year ago. So far it has help up extremely nicely. I have a usb tester called a “Qway U2p” and it can test voltage, current, charge, energy, resistance, power, graphing, as well as trigger quick charge protocols. This power bank supports QC2 5, 9, and 12 volts, as well as QC3 with a variety of voltages spaced 0.2 V apart from around 4 to 12.2 volts. This is really beneficial since I need 12 Volts to test some of my equipment that goes in my car. The powerbank is truly more than a tool! Feel free to ask me about the product.
Sounds interesting, share the link to the tester
Do you have more infos.
Testing protocols, photos, a link?
Here is just one of the many sellers!: https://www.aliexpress.com/item/33032927967.html?spm=a2g0o.productlist.0.0.de027b13Erjyw2&algo_pvid=caa98823-3238-424d-a2c0-75093a46f0ae&algo_expid=caa98823-3238-424d-a2c0-75093a46f0ae-2&btsid=0ab50f0815815823774247813e5c9c&ws_ab_test=searchweb0_0,searchweb201602_,searchweb201603_