Lead battery is an indispensable device for an automobile, this is a common sense going without saying. But the replacement of the alternator on XH200 Opel Vectra obliged me to change the recognition on the part of playing in automobile. Great advance on the X20 engine was percieved after the alternator replacement into new one, leading me to the conclusion that the electricity supplier is not the lead battery but the alternator, the task for the battery is only to rotate the starter motor and first explosion in engine cylinder also suppling electric devices, ECU, fuel pump and injectors, etc. So the main electric supplier is the alternator once after motor starting.
If the connection with battery may be cut, the automobile can continue, so the battery play only a part of big bulk condensor or capacitor.
Conclusively the performance of automobile alternator is the vest important than lead battery.
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