I just saw a video of the Hyundai Ioniq EV cannot start the car when the 12V battery is drained (or below a certain voltage theshold). Apparently, the big battery will charge the 12V battery only when the car is in the 'ON' mode but not in Accessory mode so if you are sitting in the car and listening to the radio with the seat warmer on while in Accessory mode only, it is possible to drain the 12V battery. First question, will the Clarity start if the 12V battery is drained or say in a few years when the 12V battery is getting old and if the winter temp is -30C (or whatever)? So my question for the Clarity is which electronic gadget in the Clarity uses the 12V battery and which uses the big battery? 1. Power Window and power mirror 2. Power Door lock 3. Entertainment System 4. The driver front LED screen 5. The middle 8" screen 6. Heated front seat 7. Rear window defrost 8. Heater and A/C 9. Electronic handbrake 10. Electronic brake hold 11. Auto dimming rear view mirror 12. Electronic shifter 13. Moving the car (pretty sure this uses the big battery) 14. Windshield wiper 15. All the lights (headlight, high beam, tail light, cabin light etc) Anything else I am missing? If you are waiting around in the parking lot, do you use Accessory mode (Press Start button without pressing the brake paddle) or do you always have the car in ON mode?