So strange thing . My spare battery fro levo first my 2019 Kenvo .Mu original battery doesn't but only because the hinge or whatever its called is slight thicker so won't drop into bracket properly . Could be if I cut rubber of it would fit . But I'm happy spare fits both .
If the rubber is the problem... try to adjust the axial position of it with the two screws on the outside of the battery. Loose them, rotate the rubber a bit and thighten them again.
This could maybe solve the problem