Hey Guys, I've got this JR Sport S400 radio that I want to use for my Alpha 40 flight simulator and I'm not sure what size battery to use in it. The radio that came with plane isn't what I want to use since my simulator is on the work computer but I need to practice more landings. I didn't want to haul the original radio all over the place so that's why I got the JR Sport. I thought all JR radios would take the same size battery but guess not.