Thanks for the advice....and just so you'll understand,I did not realize the battery in front was not making a difference to the cg until later on.There was no room to move it back due to the placement of the servos.I went through a whole lot of trouble installing the second battery behind all the radio gear in the rear of the fuse.It is a royal pain to get to.The servo linkages have to be removed,and a whole lot of cursing has to be done.It seemed to balance perfectly after that,so I left the first battery in.It was only recently that I realized it does not change the cg whether left in or taken out.I flew today for the first time without it.The extra 4 oz does not make much difference either way.Having the spare battery gives some added security in case one fails,or one switch goes out.But I will experiment without it as well.I did not get to experiment with changing the cg this flight,but will next time.This plane is alot of fun,and makes me look good hehe.