I use Joye and Riva with 510 cartomizers and they work well with both. If one of your
batteries won't fire the cartomizer it is probably the battery center post has been pushed down, from OVER tightening the cart0's on to the battery. All you need to do is raise the center post a little, with a paper clip or tweezers, push the paper clip down the side of the post and push it sideways a little to pry it up, and then go to the other side of the post an do it again. What you are trying to do is rock it back and forth to raise the center post a little bit so it make a good contact with the atomizer. Remember don't over tighten your caro's.