I choose to use 30q's
It's genrally what ralph ships with it. Plus it seems best performance for value compared to other high drain battery like vtc6 which are also good. http://tubo.lamart.ch/
There is a chart on the website
Just bought this mouthpiece from Aqualabs. I thought it was going to be much larger for a bong I am making but then I realized it is the same size as my spikey stem! Score! They sell these little jewels in 14mm or 18mm for only $14 and $5 shipping. Way better than spending $30 from lamart and feels good ... just wanted to share my happy accident.... Figured I should post here too after I posted in piro thread for the P80 peeps.