Yes these guys are correct, & it's the voltage cutoff that will ruin your lipo if it is not set. My first brushless set up was with an E-Flite esc too. I just assumed that it came with the bec working. You know, play first, read later? Well it turns out they are not set until you go thru the sequence on the card that came with your esc to set it up. So I go to cycling my new lipo and the plane just runs & runs & runs, I'm thinking wow this is gonna be great this thing has ran for 45 min & it still hasn't shut off ! I finally got tired & shut her down myself. Thought I'd return to cycling it in the morning. Only now it does nothing! I go put it on the charger & 2 minutes later it's beeping like it's all charged up, nothing! [X(]Turns out I reversed a cell according to the LHS where I bought it. Luckily it came good after a week it started to take a charge again. But I'm sure it doesn't perform to it's potential. So do yourself a big favor, read first, play later.