When I got my Zmax I had been using DC tanks @ 2.5 ohm and 6 volts on the Zmax was not as hot as 5 volts on my Vmax so I went with the stacked set up and now they are pretty much equal in power, well duh i could have just bought some 2 ohm DC cartos like I did last week and achieved the same "vape" on the Z @ 6volt using the 2 ohms one. A couple other things though I don't recommend it ( just my disclaimer) when I use a 18650 battery I used the extended cap as I don't carry the short one with me and I use candle wax on the threads of the caps on all my mods. I am more interested to see if V2 Zmax stops firing when you release the button than I am with the 8th sub-menu. If they bothof those things right that would be great.