Bill, my 2700mAh is a 4.8 v. What I am now having problems with is the miracle switch I purchased. Each of the switches in the back have two wires and all my spectrum stuff is 3 wire. Wish I knew more about electronic stuff, this drives me nuts!!!!! No problem Grey Beard, think out loud all ya want to. I will use at least the 6v , 1400mAh for the rx and am thinking about the 6.6 v 2100 mAh LiFe packs from LiFeSource also.