How does the e-Tron manage regenerative braking?

I'm curious about the specific regenerative braking system used in the Audi e-Tron. How does it work and what benefits does it provide?

The Audi e-Tron uses a three-stage regenerative braking system, which can capture up to 30% of the vehicle's kinetic energy as it slows down. This energy is then stored in the battery and used to power the vehicle, improving overall efficiency.

One advantage of the e-Tron's regenerative braking is the ability to customize the level of braking regeneration through different driving modes. In 'Efficiency' mode, the vehicle will aggressively capture energy during braking, while in 'Dynamic' mode, braking will feel more like a traditional gas-powered car.