so on electric models the receiver runs off the 7.2 or 8.4 main battery pack? im gunn look up on red cat and see if the elec. models use the same receiver and also use the main battery pack for power or if they have a AA pack for the receiver, if theres only one set of batteries on the elec models, then i think im gunna figure a way to use 6 AA rechargeables for a total f 7.2v, if range is dropped because of low voltage, then a 7.2 supply should work nice