I first realized there was an issue with Kia's flagship EV9 when I tried to unlock my car last year. The hulking three-row SUV was sitting on my driveway completely dead. The key didn't work, the app connection to the car was gone, and I was already late to an appointment. Luckily, I had prepared for such a scenario, after reading about widespread 12-volt battery issues with the EV9.
I managed to open the car with the manual key that Kia supplies and access the frunk to reach the 12V battery and use a booster I had purchased to jolt it back to life. Like many ICE cars, a 12V battery powers most of the low-voltage electrical systems in a ve …
