2020 Kona Ev. Set up timed charging to the morning with timed pre conditioning. Plugged it in in the evening so that it can use the charger in the morning. Turns out it leaves the car on a higher alert.

Is the 12v still usable? I tried jump starting with a pocket booster. The car turned on for 8 sec and it died again like 8 times. Is it completely dead? What to do?