Well, I got a P0101 code on my 2012 Altima (MAF), and i forgot to punch the button so the car would turn OFF.
Went out later and saw ON, and had to use the key to get in.
Prologix battery charger said 0% and 7.3v (12 degrees F).
Decided to put on 10a and charge overnight.
Now she says 12.8...