I got a Dual Coil 1.5ohm 510 Chrome Tank Cartomizer (3.5ml) from Madvapes that I use on my BB, and it works great, plus being smaller than most tanks makes it not look ridiculous. I prefer it on my SB @ 4.8v, but it still rocks on a freshly charged 14500. In fact, it's quickly become my on the go vape setup.