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

What's the best battery for tetra? — Bad Dog

I’ve been using VTC6’s. I haven’t got anything else to compare them to but I’m perfectly happy with them.

I'm using LG HG2"s. They work well usually 4 sessions on 1