The iStick TC100W Box Mod is the newest addition to the Eleaf collection. The Black iStick TC100W is the first dual 18650 battery box mod. As being the first of its kind, the Black Eleaf iStick TC100W features a Parallel Circuit Structure; allowing you use one high-rate 18650 battery or two 18650 batteries. The use of one battery has a max output of 75W, while dual batteries has the capability of reaching 100W.