This sounds amazing!
Mine works fine as stated ..... it resides in my black gearslinger bag on the front seat of my vehicles in the hot Texas sun and have never had it fail yet. It’s small but not shirt pocket small. At all day events I can put it into a 20 round AR TACO soft pouch on my belt and wire it directly to my phone . Can power a Nikon camera, my phone and a spare set of jabra wireless ear buds that I use the right ear bud as a bluetooth device for phone calls in loud environments . I recommend em .