Keys and windows didn't work at first and then seemed to 'find' themselves again after an hour or so - everything is back to the previous settings (lights, locks, windows etc) with the exception of the vehicle diagnostics in the DIS and the service indicator reporting in german instead of English, and only one of the two trip computer modes showing - it used to show a 1 or 2 in the DIS for each of 'current journey' and 'life of car modes' - now it just shows life of car mode without any mode number. Dunno if it helps diagnose but it's the DIS that comes with Satnav + - the colour one with the better white DIS readout i.e. not the basic red pictogram version. Car is 2004 model year. I'm told that there is some way of getting to the settings through the stalk buttons or the satnav/climate control buttons, but have no idea if true or how to try. Grateful for any pointers from anyone - Audi said they wanted about £70 to "code the battery to the car, so you can't just go to Halfords" which I think is a rip off load of nonsense.