Hi folks, has anyone got a clue about the dual battery system? What type of battery? Simple relay or a proper energy / loading management system? What makes and suppliers? Data sheet known? And what elements are feed by the auxiliary battery by factory fitted default? Radio, alarm, USB ports, sockets, heating, heated seats, sockets coming from overhead switches, aux heating like Webasto,...? BTW, I expected an engine auxiliary heater as a factory option... Cheers