The engine calls out for a 4.8v 2400mah for the ignition. so three batt seems to be the answer.  one for ignition, one for lighting and one for the servos. seems like alot but i dont want my lighting to Drain my servo battery.  So i would need 3 switches. If i decided to use one battery for the lighting and servos how big of battery? Is lipo the best solution?  How would all of these batteries hook up? Am i going to need a 9 channel rx?