And another thing... Just for the record... I have a Sphere 2 with the 3.3 volt cut off in the speedo, this past weekend I watch my car drop off (with LiPo this happens very fast, you go from full speed to half speed with in 25 feet), I continued to drive my car, I made a full lap, then it stopped.
So only a complete fool, would not notice this speed drop, how much is left in the pack. 6.5 volt, way above the 3.3 volt cut off. So do you need a cut off in our car, nope. It is very noticable.