Why does the Audi A1 use a 12V battery instead of a 48V battery like other modern cars?

I noticed that the Audi A1 has a 12V battery, while other modern cars use a 48V battery. Is there a reason for this difference? Does it affect the performance or efficiency of the car?

The Audi A1 uses a 12V battery because it is a smaller and more compact car. A 48V battery is usually used in larger and more powerful vehicles. The 12V battery is sufficient for the A1's electrical demands and helps keep the overall weight of the car down, improving fuel efficiency.