I just sent them a nastygram with their contact form and told them I thought it was sleazy to call that model 510-anything, that it was confusing to new vapers, and that I was going to warn people away from their model every chance I get.
BTW - the description does say it is RN4081 but as a new vaper you would not know that is a different threading. You can get 4081 to 510 adapters and vice versa is you ever want to (Goodprophets.com and elsewhere)
510-ONE battery description
"batteries for Classic (RN4081) model fits several popular model ecigs (i.e. Smoking Everywhere, njoy, etc...) If your not sure about your model feel free to give us a call."
Thanks for all of the input, guys!! I have been off for a couple of days because I live in a tourist town and work on the weekends, plus our sweet niece is visiting so I have someone to entertain. We have had wonderful experiences with our Joye 510's and are only buying from sites now that let you know up front if a part is not made by Joye. We are still using the e-cigs that we ordered in our original starter kits from Aqua Vapor, but once they are dead, that will be the end for us.
Thanks, Dormouse, for being our advocates! I felt so ignorant about all of this starting out, that I would not have thought to contact them to complain. I so appreciate this forum and the support that I get here (and the support that my husband gets second hand through me!). =D