In regards to the self discharge issues with EVE 50PL batteries, reported on several places on the internet, Nkon has now listed a ‘new version’ of the 50PL, on which they state: “This is the latest version, with no voltage drop issues!”
https://www.nkon.nl/en/eve-inr21700-50pl-5000mah-125a.html
Biggest visual identifier I can see so far, is the different position/placement of the trashcan/wheelie bin symbol.