2004 Toyota Prius Owners Manual - Page 22

12p019c 12p020c 12p030b Storing electric power Not in use When decreasing speed or applying the brakes, the turning force of the wheels makes the electric motor operate as a generator and additional electricity is stored in the hybrid vehicle battery (regenerative brake). When stopping, the gasoline engine automatically shuts off. Charging hybrid vehicle battery When the hybrid vehicle battery power is insufficient, the gasoline engine charges the hybrid vehicle battery. The system always supplies electricity at a constant level. 10