I have four Riva 510 batteries in my personal stock and can tell you that all four of them work with three tanks that I have at present. The form, fit and function is identical to my Joye ego batteries that I have too. I hope that helps your search for compatability of the two.
Cheers!
excellent news. i'll purchase some ego-T atties and tanks right away. the B.F.D. cart mod has been working perfectly, but it sure would be nice to fit a full 1.5 ml... that would last me all day. anyone have a suggestion for a particular supplier?
EDIT:
question, though... looking at the ego-T atty, it appears to be cone shaped and therefore the cone-shaped cover that goes over the normal 510 atty wouldn't be necessary. so, since the Riva battery has the two threadings, one for the atty and one for the cone, my question is: does the ego-T atty screw into the threads for the atty, the cone, or both?