I built a drone using Drone kit (Pixhawk and RPi 4) with PX4 and QGroundControl. Before arming, everything is normal, but once armed, the drone briefly spins the motors, disconnects from QGroundControl, and the Pixhawk lights dim as if low power is supplied (the warning shows that low battery warning.). Any solutions for this issue? Is the issue with battery itself (battery is new)?
Note: The battery is fully charged, and all seems well until armed.