In that case, the 12-volt battery will continue to power the car's systems. Rivian faced a massive problem in March after the 2023.6.2 update broke the connection between the high-voltage and 12 ...

Not every electrical component will switch to 48-volt. Lights, radios, electric windows and door locks, for example, would stay 12-volt.

Depending How They’re Wired, two 12-Volt Batteries Yield a 12-Volt System with Double the Amps, a More Efficient 24-Volt System Twice the Cranking Speed.