This dual battery system is designed to use an external battery independently from the internal one. The switched operation means that while we use one battery, the other remains disconnected, creating an independent battery circuit. We use one and when it runs out, we switch to the other one. This system is achieved through the switching connector. It is the most reliable system as it does not modify or mix electronics. It would be like removing one battery and putting in another, but in this case without dismantling the internal one. ```html

This dual battery system is designed to use an external battery independently from the internal one. The switched operation means that while we use one battery, the other remains disconnected, creating an independent battery circuit. We use one and when it runs out, we switch to the other one. This system is achieved through the switching connector. It is the most reliable system as it does not modify or mix electronics. It would be like removing one battery and putting in another, but in this case without dismantling the internal one.