Without power, the car can't move except Pavo or Pavo. Many car owners have experienced the situation that they can't start their cars or even miss major events because of sudden battery failure. Afterwards, the owner called a professional maintenance worker. The repairman found that there was nothing wrong with the starter through inspection, and finally locked the battery problem.
In other words, when the battery is used up, it needs to be replaced, and a new one is enough. Therefore, some car owners once again put their previous tragic experiences behind them after replacing new batteries. Maybe we have to wait until the next big event that the car can't start because of battery problems before we remember to take the time to understand the car.
So what do you know about car batteries? How many years can the battery last? How long is the battery life of a car? What are the symptoms before the battery is damaged? How to judge whether the battery is dead? I'll teach you several simple ways to judge the state of the battery. Through study, you can also master some knowledge about batteries. Battery life is not infinite.
The normal service life of automobile batteries is 2~4 years. If the service life is more than 5 years, it often happens that the battery does not catch fire occasionally. At this point, the first suspected fault point should be the battery. If you can start the car in summer, it will be difficult to start it if it is a little colder. This battery should be replaced.
Cars were made by hand a hundred years ago. Modern engines are driven by starters to rotate and then start. When we insert the key and turn it, we will hear a click sound, which means that the starter is working. This product is a "big power consumer" in the car! When the starter works, the current easily exceeds 100A or even 200A.
Therefore, if the battery performance is good, the battery has the ability to output super current instantly. The voice of the starter "bursts" sounds crisp! As soon as the key is turned, it will start with a bang in two seconds at most. However, after the battery is aged, the ability to release excess current instantly becomes worse. Therefore, when the car starts, the sound of "galloping" becomes slow and weak.
You should be careful with your battery at this time! This is a very bad signal. Your battery tells you "it's almost dead". On the other hand, every time the engine is started, the clock will return to zero, and the one-button window-raising function will fail. This situation is due to the lack of battery power when the engine is started, and the battery voltage drops excessively, which leads to the restart of the on-board computer, which is equivalent to the power failure every time the engine is started, and the battery needs to be replaced.
Self-service test of automobile battery
As mentioned in many articles, there is a "small window" at the top of the battery to judge the health of the battery, and the health of the battery can be simply judged by observing the color of the window. But in fact, many times, the reliability of this observation window is very poor. Therefore, it is not recommended to judge the battery condition through the observation window.
We know that in professional repair shops, technicians usually need to use special battery detectors to judge the remaining life of batteries. But this is impossible for our car owners. Buy a multimeter at most. Then I'll teach you how to roughly judge the battery condition with a simple multimeter.
The nominal voltage of automobile battery is 12V, and the actual voltage is higher than this. When the engine is not started, the voltage between the positive and negative electrodes measured by the multimeter should be between 12.5- 13v. If the measured voltage is lower than 12V, the battery is low. At this time, the engine is difficult to start, and the battery needs to be charged.
If the measured voltage is lower than 1 1.5V, the battery is basically completely exhausted, and the battery at this time is not enough to start the car. Even if it is recharged, such a battery is difficult to meet the prescribed standards and should be replaced.
The above measurement methods only detect the approximate capacity of the battery, and dynamic voltage measurement is needed to further accurately detect the "super current discharge capacity" of the battery. Connect the red and black pointers of the multimeter to the positive and negative poles of the battery respectively. People inside the car start the engine, and people outside the car observe the multimeter. If the voltage drops below 9V, the battery is basically useless. @20 19