I also have run 6v batteries in Futaba RX with no problems and I still run a couple of them,,but I think if you gonna spend the money in regulator I would get the Li-ion batteries too!!! so you regulate the 7.2v to like 6v, the Fromeco 2400mah are only like $27 which I think it's really good price for a li-ion battery,, and you can fly a lot with one charge!!!!