Speaking of 11.9V... I just installed (on weekend) an Android head unit as a replacement to factory basic one, in wife's Forte. It gave me an option to display car battery voltage on screen, it was 11.9V while engine was off. Voltage went to 14.4V when car was running.
Relatively new battery, about 2 years old. I'm not concerned about the battery, bought it at Costco, it came with 4 years free replacement warranty, 100 months total warranty (prorated after 4 years).