I wrote this so I wouldn't get asked....
7.4v/4400mAh/???C rating....probably in the 35C range (so 154A on tap)...I'll bet it'll be a sweet screamer.
I'd check the motor engagement first with a lower powered batt when you're setting it up...get it in the sweet spot first...then go for it. Some guys swap off the pinion gear from Magnums....I've never had one fail, but I guess others have.