I have a 650 mAh with a plastic atty for out and about, and when I wanna just walk around outside. And I have an iTaste 134 mini that I use in my room, going back and forth between the iClear X.I that came with it and an AeroTank, each with different juices. I'm brand new here, so I'm still learning. I like switching between the ones I have....they have different 'draws', so they all feel new to me every time!