+1 JP;just remember when a fully charged 6V batt is more than 6V,I run a 6V system on all my planes and also a voltage regulater set at 5.8 so no to fry my receivers,I dont worry about weight all my planes are 120" and larger,one gent said he runs only fm receivers thats fine with glow for spark plug engine PCM is a must to stop electical noise geting to the controls.