Hi Mark, I use an ego batt and 1.7ohm resurectors metal cartos and a pen cap (from gotvapes.com) for walking around at work. I work at a cement plant (very dusty) and the pen cap keeps the carto clean. The ego style batteries then can take alot of different cartos and tanks. I throw on the stardusts or large ego carts at home. You could also consider a ego passthrough battery so you can vape while it charges.