Hello, Stash, and welcome to the Burning thread!
My favorite go-to setup is the Ego-T contraption, consisting of a specially designed atomizer and fillerless tanks. There are dozens of threads analyzing the pros and cons of this new system and they are worth reading.
The system is designed to work with all the eGo/Riva/Tornado class fat batteries. They look like this:
https://www.cignot.com/category_s/67.htm
And this is my favorite video showing how to use them:
http://www.e-cigarette-forum.com/fo...-ovale-ego-t-two-weeks-short-review-tips.html
This is the most definitive and comprehensive thread, started by our Italian friend Ournature, who was one of the first users of the Ego-T system when it was first introduced in Europe. The thread is almost as long as this one, but you can safely skip the first half of it. It's all there--anything you want to know (and things you don't want to know).
http://www.e-cigarette-forum.com/forum/general-e-smoking-discussion/139915-new-ego-tank-system.html
If you are really curious but have no interest in investing in the new eGo or Riva, you can just order an atty and a box of tanks (just don't buy the black ones as they are opaque and you can't see how much juice there's left in the tank) and try them, with an kr808>501 adapter, on your kr808 battery. It looks funny, but it works (just ask Neo). You can get an adapter from Good Prophets for $0.99. (You can get an eGo-t atty and tanks from GP also).
Many other vendors carry them, shop around for a good price; Liberty Flights, Volcano, Clouds of Vapor, FMUSA, just to name a few. Keep in mind that almost everyone is temprarily out of stock due to the Chinese New Year holidays, but they should be restocking as we speak.