That's really low for a resting charge, almost dead. Would likely not start it. I would find a way to slow charge it (3amp until full) and then stick it back in and see what you get. If it starts without a jump, then keep an eye on it and see if it drops again. If it does, then you either have a bad battery or a parasitic draw in the system somewhere.
The EEC and stereo memory voltages are not enough to draw a healthy battery to 10V overnight. There are how-to videos explaining how to check for parasitic draw using a meter between the battery cables and the charging system.
