I went too fast on my 820Wh wheel this morning... It stopped balancing around 45 km/h in the decline, tiltback was disabled. I was not accelerating but the slope increased the speed and triggered a cut off. (Braking was needed to keep the speed down...) No serious injury. Left hand hurt a little but already starts to feel ok now after an hour, wrist guards took most of the impact. A minor scrape on lower left arm and a tiny scrape under right knee, had three layers of clothes, no knee/elbow