@Haktuspit - The mod RJ showed is an Innokin Coolfire IV 40W mod. It's an internal battery mod, and like many of the eleaf istick mods (also internal battery)...just keeps on working. I have an identical one and also in 4 other colors. They feel great in the hand and work like a charm. Not sure what the tank is on it in the picture though.
Looks like a Kayfun Lite to me.