Honestly, I feel a bit cheated when my Nitecore UMS4 arrived. Based on the images, I was certain it was USB-C, because of course it is! It requires power, naturally it is USB-C these days - and I didn't think to read the fine print that said "micro-USB"...
But oh no, that is actually micro-USB, with (fortunately) an included USB-A to micro-USB cable. Just pure luck that one of the chargers for my phone had a USB-A outlet so I could actually use the UMS4, because any power adapter that I have and can find that can deliver more than 15 Watts is USB-C.
I have no luck finding the specifications for power delivery through micro-USB. My only guess why Nitecore went with micro-USB, is precisely because it is so hard to find cables, so certain people won't use cheap, inferiour USB-C cables. But if that really is the case, then I am not impressed with the quality of the included cable. I like overkill, so I prefer using a 100 W certified cable for my 25 W charging needs - and I find no specs for the included cable AT ALL!!
EDIT:
I wrote a whole rant on the Nitecore UMS4 here:
I just bought a Nitecore UMS4 charger, and having tested it - i.e. used it as a battery charger - I have some thoughts on it. Figured I'd share them. Sadly, it becomes mostly a rant. https://charger.nitecore.com/product/ums4 I will not get into the technical details and specifics and statistics...
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