Guys, I'm currently building my 2nd (and 3rd for that matter) Battle Axe kits and need to pick up a couple batteries. I honestly can't remember what size pack I used in the first one, so I'm trying to figure out what fits. Obviously I'll probably go with a 4.8V AAA or 2/3AA pack but not sure if square or flat would be preferred for fitment reasons. Thought I would ask the guys who would know right off the bat.

I'm going to be using Hitec Minima 2.4 receivers so I did consider using 6V packs, but I'm probably just overthinking things there.