Please help. So have a dead Fisker with another 12v battery issue. what would cause the battery to just immediately go bad. i mean just bad.. not just dead. as in will not take a charge or even read when the battery is connected to the charger. this is the second battery and it went bad in about 24hours or so. and i did make sure to completely remove the 12v battery to test out of the Fisker and still nothing. i then verified it wasnt the charge by connecting to another vehicle battery and everything worked properly.