I have an Anker Switch version powerbank, the 13400 version and think it’s great. I think it differs from the non-switch version, in that it also has USB-C rather than other microUSB and USB-A, so can charge itself from the USB-C port much faster.
However I can’t seem to find availability anywhere in UK now for it. Is it discontinued now? Is there a replacement? Need a USB-C and like the size of it.