Product Review (submitted on June 21, 2021):
These cups fit perfectly and do allow for larger capacity batteries to fit into a Tx, however, I stick with the original cups and smaller cells. On my X-Lite Pro, the color of the extended caps is 100% the same as on a transmitter, but the texture is a little off, as well as the shape. Also, larger batteries add some extra weight to the radio, which I don't need.
So, great to have it available, but I stick with the originals ;)