SMC packs are good battery packs, youll like them. The main numbers your going to want to look at is the runtime since its a little more important to finish a race than win one. 409 seconds should easily be enough to finish a race assuming the race is around 4-5 min. But the big factor that determines if your batteries will last the race or not is gearing. Check with the local racers to make sure your roll out is close to theres.