Baotian QT-50 – Power failure at E-Start

Servus together… I’ve been having the problem since anew that I notice a complete power failure when I press the E-starter button. Interesting: When I start the scooter by kickstart, everything runs normal. When I turn off the scooter by key and turn on the ignition again, there is also electricity. As soon as I press the EStarter, however, the current is immediately gone. It just clicks quietly and that’s it. Now it doesn’t bring anything to use the key. No power. What happens, however, if the scooter is running and I then feel the Estarter, I have not tried yet, would be nonsense!? One an idea? Greetings and thanks for every idea!