Yes you can. I just wanted an internal battery mod and it's tiny (easier to hide)...and when that one craps out I'll have my solos. Variety. I picked up a couple of squonkers, some mechs, battery mods, and an internal. I think I'm covered nicely. I started picking up cheap outdated stuff but I quickly went with better quality newer mods. So I have some cheap stuff too. Fasttech has my well loved Innokin coolfire, but I'm trying to stay away from outside of USA. But you never know...I love that thing.