The battery I am using is a new Tenergy 2000mAh nMHi fresh off the charger. When I tested the Tech-Aero IBEC on the other engine with the larger sized RCexcl ignition module the range was amazing. The plane was sitting on the bench in my house building project and I walked a good 60 feet away and into the shop. The antenna was collapsed. I also noticed the tx battery was down to 7.8 volts. Maybe someone who knows RCexcl ignition modules could enlighten us on the differences between the regular size module and the newer smaller one used on the Evo 10cc.