Hi all, have just purchased brand new 2009 Euro Luxury Navi and managed to discharge the car battery very rapidly by setting up the SatNav while engine is off. Am I being a noob for doing this or should the new battery last a lot longer?

I was doing it for 20 mins then the Satnav screen flickered and the battery charge indicator came on. Could this be the service department did not do their pre-inspection properly and battery is not fully charged or does the SatNav drain so much power that when you are setting it up you need the engine idling???