What are the misunderstandings when using 9V carbon battery, and what should you pay attention to when replacing them?

　　Misunderstandings in the use of 9V carbon battery, such as forgetting to turn off the lights after parking, causing the car to be unable to start the next day. Avoid using electrical appliances after turning off the car. In addition, when replacing, pay attention to the same brand and model, and use a battery tester for testing, etc. The relevant details are introduced below. content.

　　1. Misunderstandings about the use of 9V carbon battery

　　1. Any operation of using electrical equipment in the car for a long time after turning off the engine will cause the battery to be over-discharged. For example, if you forget to turn off the lights after parking at night, the engine will not start the next day. A large part of the reason is due to the failure to turn off the car in time. Turning off the lights causes the battery to become depleted, at which point the battery's performance may have been significantly reduced.

　　2. After shutting down the engine, you should try to avoid using electrical equipment, such as audio, DVD, radio, lights, air conditioners, etc. for a long time. The time should not exceed 30 minutes. If you must use electrical equipment, it is best to start the engine with the generator. electrical energy.

　　3. When the engine is started, the battery will discharge with high current, but long-term high current discharge will greatly damage the battery. Each start time should not exceed 5 seconds. If it is started twice in a row, there should be an interval of 10 to 15 seconds.

　　4. Since the raw materials for manufacturing batteries cannot be 100% pure, there will always be impurities mixed in the middle, so the battery will inevitably have automatic discharge. The anti-theft alarm also needs electricity after turning off the engine. Therefore, for a long time When a vehicle is parked and not in use, the battery may be over-discharged. If the vehicle is parked for more than a week, please remove the negative connector of the battery and cut off the power supply.

　　5. Try to avoid using the car battery with external high-power electrical equipment. Such equipment consumes a lot of power and may cause the battery to over-discharge. If it must be used, it is best to start the engine while using it and let the generator Powered by the battery.

　　6. Do not overcharge. If the voltage regulator of the car alternator is not set correctly, the output voltage of the alternator will be high. When the charging voltage exceeds the maximum limit voltage of the battery, overcharging may occur. At this time, If the fault is not checked and eliminated in time, the battery will overheat, causing abnormal consumption of electrolyte. Overcharging will accelerate the decomposition of active materials on the battery plates, causing the battery to fail.

　　2. Things to note when changing 9V carbon battery

　　1. Before installing a new battery, if the battery brands and models are inconsistent, compare the dimensions and terminal positions of the old and new batteries, and carefully check the battery capacity and cold starting current parameters. Especially in northern winter, if the cold starting current does not match, it may cause difficulty in starting the vehicle.

　　2. If conditions permit, a battery tester should be used for testing. After some batteries have been stored for a long time, although the voltage between the positive and negative poles is higher than 12V, the actual capacity is not enough, which is the so-called "virtual electricity". This is needs to be recharged. It should be noted that measurement must be carried out when the ambient temperature is higher than 0, and charging must be carried out when the ambient temperature is higher than 5.

　　3. Place the new battery into the installation position and secure it. For batteries with a breather tube, don't forget to remove the breather tube connector from the old battery and install it on the new battery. For lead-acid batteries, pay attention to the inclination angle of the battery not exceeding 30° during installation.

　　4. When connecting the battery wiring, connect the positive terminal first and then the negative terminal. After the installation is completed, anti-rust protective agent or acid-free grease can be sprayed on the battery terminals for protection.

　　5. After checking and confirming that the tightening is reliable, you can remove the external power supply. Start the engine and check the generator voltage. You can measure it at the generator output or on the battery terminal. If you have special diagnostic equipment, you can also read the voltage data in the data stream. In addition, it is recommended to perform measurements at engine idle speed and 2000 r/min.

　　6. For vehicles whose batteries are replaced due to discharge failure, the dormant current of the vehicle should also be checked. The traditional method is to put the multimeter in the current block, then connect it in series to the negative line of the battery, lock all door locks, turn off the ignition switch and activate the anti-theft system, and let it sit for a period of time until the current stabilizes.

　　7. For vehicles equipped with power management systems and sensors installed in the negative line, such vehicles can only use equipment such as clamp-type ammeters for current testing. Generally speaking, the vehicle's sleep current should be less than 50 mA (according to the model maintenance manual, for example, some BMW models only require less than 80 mA).

　　8. After the replacement is completed, a diagnostic tool should be used to clear the relevant fault codes recorded in the system. For vehicles equipped with power management systems, such as vehicles from German brands such as Mercedes-Benz, BMW and Audi, it is also necessary to enter a new battery model into the power management system and perform a system reset.

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