How does the Audi A8 use its mild-hybrid technology?

I've heard that the Audi A8 has a mild-hybrid system. Can you explain how this system works and how it improves the car's performance and fuel efficiency?

The mild-hybrid system in the Audi A8 uses a 48-volt battery and an integrated starter generator. This helps to reduce fuel consumption and emissions, while also providing a boost in performance when needed. As for specific details, the system can recover up to 12 kW of power during braking and coasting, and the electric motor can provide a boost of up to 8 kW to the engine during acceleration.