And what is this you might ask? Well, I'm a great believer that you can't have too many QC3.0 power banks (i.e. FAST charging). I use them all the time for our various Smartphones in the UK and in Spain.
This model is the "BlitzWolf® BW-P9 10000mAh 18W QC3.0 PD3.0 Type-c + USB Ports Power Bank" and it has a single type C input/output connector as well as a normal fast charge (QC3.0) USB output and comes complete with a short USB (one end) to type C (other end) lead.
Check out the stock photo and specs in the link above. I have nice things to say about Blitzwolf kits unlike some of the Ebay rubbishy power banks I've bought in the past.
Here's my own photo. The unit is neat, has rounded edges, satin black metal quality finish and has 10,000maH capacity (apparently - it may be while before I can prove that but in the past, Blitzwolf have not disappointed) and comes complete with manual. It also supports Apple 2.4A fast charge. Though not obvious in my photo there are 4 neat LED indicators.
The manual is in decent English, German, Spanish and Japanese and properly describes operation of the product. The LED area is also a POWER BUTTON. The unit is on charge but actually arrived almost fully charged which is lovely.
Meanwhile, on the subject of powering Raspberry Pi, I've contacted several suppliers and designers, so far no joy in finding a reliable 5v 3A supply for the Pi4. Plenty of 2 amp battery packs but few actally simultaneously charge and discharge at that rate while guaranteeing up time and minimum 5.1v sustained output - and I've found none that do that at 3 amps - if you know differently please DO write in. I wrote to Callahan Kovacs who seems to have something not far off but neither of his designs are in production and I don't have time or patience to build an SMT power unit. SURELY there must be others?