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https://www.youtube.com/watch?v=xGUhUk2ac0w
Smart Hybrid Vehicle by Suzuki
Once you’re on the move and building up speed, the ISG will assist the engine during the during fuel-consuming acceleration. Then, while you’re cruising, the electricity that was stored during acceleration is used to power some of the electrical components in the car. At the same time, performance is maximised by focusing the power of the engine on driving instead of charging.
As you begin to slow down, the ISG efficiently converts the kinetic energy to electrical energy, charging both batteries – and when you apply the brakes, generation output increases to charge the battery further.