Cheap thrill here ($21.99). This little fellow can evaluate the performance and capacity of a USB power bank, and by extension an emergency radio that can charge a USB device. I have no confidence in product promises for battery bank capacity. I know that some of them, based on their weight alone, have impossible capacity specifications. One example had an advertised capacity MORE THAN THREE TIMES the theoretical maximum based on its weight.
When this arrives next week, I probably won’t publish an article on it, but I will be using it to test some of the power banks/emergency radios I have.
Update:
Well, that was fast. Careful reading of Amazon reviews and finally access to a product manual suggest that this model (the UT658DUAL) doesn’t supply a load. Some Amazon reviewers say it only provides a load for USB-A and not USB-C, but the manual says no load, period. So I ordered a load. Fortunately I caught it in time so they both ship together.
These only work for USB-A, but all of the things I have to test include USB-A outputs, so I should be good.