battery or models that can switch between 2-piece & 3-piece?

[Joe81]

anyways, seems a 2-piece would be good for convenience, while a 3-piece would be better for reusability & saving on juice after i figured the basics...i never vaped before, so i'd like to try both...as the title states, is there a battery or model that can work with both a cartomizer and atomizer/cartridge?

PS. regardless, i also plan to get a 510...and maybe an SD someday...

 

[Joe81]

also, is there such a thing as a 'skin' case or cover to switch between the appearance of an analog cigarette & a traditional ecig...think thats all my noob questions, forum searches have answered most of my other questions...