I ran the whole last season on 4s 5000 mAh 30c Turnigy batteries in a converted D8 with the CC 2200kv combo. geared 15/48 and won most races in my class. Even in the hottest days of August the motor never got above 160F after a 15 min. main! I don't need $200.00 battery packs to win races thank you very much