The Kanger eGo T2 is designed to work very with the very popular EgO series of batteries. The T2 has a large 2.4ml tank capacity, and replaceable atomizer heads.  The Kanger T2 is EgO threaded to work with most EgO style batteries. These work very well on all the EgO series batteries, especially the EgO-C Twist batteries.  The atomizer head being at the top of the tank, provides a nice warm vapor, with a superb clean flavor.  The absorbent wick material on the replaceable atomizer head feeds the liquid from the tank to the atomizing coil.  The T2 has a very nice smooth draw, not stiff like some clearomizers.