I marked 2 ,Working Normal ones. (Aura2 and a K4nt)
My EZreader (#3) has a very weak battery

with no obvious replacement source
I don't count my Tablet Moon+). I did not even bother to install a reader app on my phone.
My Kobo is my current (k)EPUB reader
The K4 is for when Amazon DRM is (still) there
The Tablet is for when COLOR is
needed (charts, Diagrams)