The Innokin Cool Fire 2 takes one 18350 battery. It is shaped like a grenade which looks awesome, but more importantly it conforms to your hand almost perfectly. It is variable wattage, which can be adjusted by turning the ring around between 7.0, 8.0, 8.5, 9.0, 9.5, 10.5, 11.0, 12.0 and 12.5 Watts. 3
You can turn it on with 3 clicks of the firing button and the light will flash a different color based on how charged the battery is. (Green is over half full, yellow is halfway, and red means it is under.
Should last up to a few days between charges.
The top has connection for 510 and eGo tanks, and comes with a removable beauty ring.
Requires 1 flat-top high-drain 18350 battery (NOT included)
Requires a tank (NOT included)