Any more than 2 cells and I would use a Zip Zap, but thats just me. I like the bunta vertical 2 cell, you still have to stick a cell out the back. In fact I was just thinking of trying that mod on my Fairlady Z. I have about a dozen cars that run, half zips, half bit/ microsizer, and all my two and three cell cars are zips. Three cells fit nicely in the chassis of a zip zap
