In a parallel hybrid car, the fuel tanks upplies the fuel to the engine and the battery supplies the electric power to the electric motor．
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- When the series hybrid car is in the condition of starting, accelerating, or climbing, the engine, the generator and the battery together supply electric power to the electric motor．
- When the engine, generator and battery work together to supply right amount of electric power to the electric motor, or the engine and the generator charge the battery pack, it operates in series mode．
- When the car is at low speed, coasting or idling, only the battery offers the electric power to the motor．
- Nowadays, the electric motor, generator and battery pack all work together in a car on behalf of the hybrid concept．
- Drive battery: is a high-output battery that stores electricity generated from regenerative braking and provides additional electric power to the electric motor;