Well all it has finally happened to me after warning the supplier who repaired my H520e about the battery issues and battery switch the H520e when down and crash after a power lost. The battery switch or connecter could had have caused the power lost at 15ft while checking the flight control system. After the mind blowing crash all I could think was who could have been seriously injured or what property damage could have occurred after starting my test flight. I have filed a request for assistance but have yet to hear back from anyone yet (day one). I hope Yuneec realizes how serious this issues is and understands how they are putting peoples lives, our businesses and reputation as competent pilots at risk not to included potential lawsuits. I will keep you all informed!