Ill make a comment about zippy packs. They suck. Turns out, 1 cell 4.25, 2 cel 4.25, 3 cell 2.1. Uh, yea, thats why it fell out of the sky. That battery caused the escs to fail I am assuming. Flew on a 3c turnigy just fine tonight. Glad I was over dirt instead of cement, asphalt or people...