That would be correct. I highly doubt the Auspack unit will be at fault. It's pre-wired and plug-and-play. With that said though, there was always the possibility of a fault. The only thing I could think of that would drain your battery flat like that would be your headlights left on. The thing is with the Aurion is that one you turn your car off and open the drivers door, your headlights will turn off automatically. The only way to leave them on is if you turn them on AFTER you turn the car off and leave them on. Otherwise, the only other thing that could drain your battery is if you manually turned on the dome light and/or left your map lights on, but this can take a little bit of time away from your car to completely kill the battery. Leaving a door open and leaving your dome light to 'DOOR' would not usually kill you battery since the Aurion has a power save feature in that after 30 minutes of opening a door, if there is no activity and the dome light/door light is still on, it will automatically turn off. I remember when the installer was installing the AUSPACK unit, he found a connection that was removed from the stock head unit, which did not have any place to be plugged into the AUSPACK unit. Did you guys find this as well with your own AUSPACK unit installation? Could leaving an extra connector "unconnected" cause the battery to drain?