Hey Bruce, ya wanna see light packs.......check out Power Flight lithium-ions. 2000 mha regulated to 6 volts and about the weight of a 800 mha 4.8 volt nicad. If ya buy 2 and regulate one @ 4.8v for ignition and the other @ 6v for the receiver you save about 1/2 pound, aint technology cool!
:^)