I'm flying mine with a Wren in the tail and to balance it out I have two 2200 Nimh in the nose along with a big turbine battery. This combo balances the aircraft perfectly. If you use LiPo's then you wont get the weight and may need lead. I use an Emcotec switch and both RX batts run through that, I wouldn't dream of flying with out the redundancy, always use two batts in a jet. On a different note I'm currently having a major hassel with FEJ in getting spare parts. I had a nose leg collapse and it wrecked the nose door/ cone and pito, so I e mailed them asking for the parts along with a new nose leg. They managed to get everything apart from the nose cone wrong, problems with translation they told me. Trouble is if you look at the spares they call a wheel rim an axle so it all gets a bit complicated. Hopefully getting it sorted this week.
Nightswan are u using the ailerons as flaps?