This is something a lot of people get confused on. An eGo is just a 510 threaded battery. You can get them in "kits" that come with atomizers, cartomizers, tanks, etc. I personally never boutht an ego kit. Instead I made my own by buying a charger, 2 900 mah ego batts (biggest they had back then), and some boge cartomizers. I stuck with those for a couple years. Only recently have I moved on from them as their quality seems to have gotten worse. But don't get confused by the "kits". Just because that's what it comes with, doesn't mean that's what you have to use. All eGo batteries and knockoffs will have the same 510 connection that a blu has. As long as it says eGo on it that is. Hope this helps.