With my Blade helis I don't need to rebind. What protocol do you use, DSM2 or DSMX? With DSM2 protocol Blade DSMX models not always bind from first power on, I need reconnect battery 2 or 3 times to bind. With DSMX protocol model always bind from first battery connection.
Walkera recievers use autobind feature. They always autobind at power on. First you need power on Rx, then Tx. To eliminate this, you can use Fixed ID.