Eat your heart out again bad. This one puts out more vapor than yours. Maybe even twice as much, heheh. I suppose you could call this one a twin E2. It's two coils in series, giving a total of about 6Ω. This means that each coil is working at about 3.7 volts, so it's safe to operate it at 7.4 volts. The vapor at this voltage goes beyond insane and it does not ruin the taste of my juice. However, about all this amounts to is bragging rights and I didn't put it together so that I could use up more juice.
The object of this experiment is to find out how bad the gunk buildup will be at a lower voltage. I am getting very good results at 4.2 volts, which means that each coil is working at about 2. 1 volts. I have no idea what the gunk buildup will be, but I plan to find out. This is about the lowest voltage that it will work. It doesn't do hardly anything at all on a 3.7 volt battery.
The additional coil and wicks are resting on the rim of the cup and the two coils do not touch each other. Nothing is holding them in place but the wires. It's all installed in a 3/4" diameter bottle.