I just got the Traxxas X-Maxx 8s Rock N Roll edition. My question is if I do not have two 4s batteries can I use 1 3s 5000mah 50c battery and 1 4s 5000mah 50c battery? That would be a total of 7s that sounds odd even saying it but untill I can afford to get another battery is either do that or run 2 3s batteries.