1. When starting the engine, it provides a strong current for the starter, and at the same time supplies power to the ignition system and other electrical equipment, so that the engine can start smoothly.

　　2. When the engine is working normally, the excess electric energy of the generator is stored.

　　3. When the engine speed is low or the power consumption of the whole car is too large, storage batteries assist the generator to supply power to the electric equipment of the whole car.

　　4. When the engine is working normally, the ignition system will generate a high voltage of 15,000 to 20,000 volts. At the same time, some magnetic induction sensors will also generate a high voltage of thousands of volts. High voltage breakdown protects ECU and other electronic equipment from working normally.

　　maintain

　　(1) Frequently remove the dust and dirt on the surface of storage batteries. If electrolyte splashes on the surface of storage batteries, use a cloth dipped in water to clean it, or rinse it with water directly. Excessive surface dust or dirt will generate static electricity, which will cause the self-discharge of storage batteries.

　　(2) For dry-charged storage batteries, always check and adjust the height of the electrolyte liquid level, which should be 10-15mm higher than the electrode plate. Frequently unclog the vent hole on the filling hole cover.

　　(3) The storage batteries of parked vehicles should be recharged once a month. When the vehicle is parked, some electrical equipment on the vehicle is still working normally, such as: anti-theft alarm, central door lock, etc. There are also any storage batteries that produce self-discharge, and storage batteries can only be stored for a long time when they are fully charged.

　　(4) Vehicles in normal use should be recharged once every two months. Especially for short-distance vehicles, stop and go, the starter is frequently used, and the discharge capacity is large. Each time the starter is used, the engine has to run for 20 minutes before it can be fully charged. If the vehicle is stopped for 10 minutes after starting the engine, This time I lost power for 10 minutes. After long-term accumulation, the storage batteries will be in a state of power loss. Only replenished once every two months, which can not only supplement the electric energy of the storage batteries but also eliminate the slight vulcanization on the plate.

　　(5) At present, a large number of maintenance-free storage batteries are used in cars. Maintenance-free storage batteries mean that during the entire use process, there is no need to supplement distilled water or electrolyte, but normal cleaning and supplementary charging should be done. Always check the color of the storage batteries inspection hole, generally green is normal. Colorless means insufficient electrolyte and storage batteries need to be replaced. Black is for charging. The judgment of the specific color should be operated according to the instructions on the storage batteries.