Drone Manufacturer: Yuneec
Drone Model: Q500 4K Typhoon
Country: United States of America
Pilot Qualifications: Licensed or Certificated by Aviation Authority
Pilot Flight Experience: 20 Hours
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Moments after takeoff, on a freshly charged battery, My control station(ST10+) gave a critically low battery warning, and the aircraft auto landed, hard. Hard enough to flex the landing gear.
I could find no damage to the aircraft. It did land just about where it took off from like it was supposed to. I changed batteries, and have had no further issues. I also retired that battery.
My best guess, from what I have learned about Lipo batteries, is a cell failure in the battery.