Been driving mine for nearly a month now, and no 12V issues at all! At home, I’ve got my EV9 connected to a Level 1 charger while waiting to get my 240V setup installed. Yeah, it’s not speedy, but it gets the job done for now!
Sadly, yes, some Kia EV9 owners have reported 12V battery issues within the first few months of ownership. I remember reading about one owner who experienced a dead 12V battery after just over a month and 1,000 miles. Another reported the 12V battery draining twice within a few days of each other. These issues can be concerning, especially for new owners.