How does the energy recovery system work in an Audi A2?

I've heard that the Audi A2 has an energy recovery system. How does this system work and what are the benefits?

The energy recovery system in an Audi A2 works by regenerating energy from braking and coasting, which is then stored in a lithium-ion battery. This helps improve fuel efficiency and reduces emissions.

The energy recovery system in an Audi A2 uses a motor generator that converts kinetic energy into electrical energy. This energy is then used to power the car's electrical systems, reducing the load on the engine and improving efficiency.