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voltage gauge going down battery dead
What happens if the voltage of the car battery decreases? Low voltage of automobile battery indicates insufficient storage capacity of battery. When the voltage is low, the car cannot be started, and the battery will be injured twice. In this case, the trip to work, shopping and travel will often be delayed, which is not very annoying. However, due to various reasons, it is almost inevitable that the battery voltage is low. However, we can first understand the cause of low battery voltage and try to avoid the occurrence of low battery voltage.
The first reason for the occurrence of low battery voltage is that the car is idle for a long time. Because of the internal structure, specific gravity, temperature and impure substance of the car battery, the battery tends to self discharge. Generally, 0.5~1% of the electricity will be discharged within a day. If the car is idle for a long time, it is easy to cause the battery to discharge excessively and cannot continue to charge.
Nowadays, ordinary car batteries generally adopt the lean solution design, and the water in the electrolyte will naturally gradually volatilize, which will gradually form white lead sulfate. After the internal electrode plate of the car battery is severely lead sulfate, it is impossible to recharge and replenish water, and its capacity cannot be restored. When it is suspected that the car battery voltage is too low, we should also check the generator. Sometimes it is the problem of the generator that causes the battery to fail to charge normally. The battery itself has no problem. If it is confirmed that there is a problem with the battery, it is necessary to replace the battery.
For example, the current of 4v common lead-acid battery is only tens of ma when it is used at 2v. In fact, you will find that if there is 500ma at 4v, theoretically there will be 250ma at 2v. Why does this happen? The internal resistance is actually a conductive medium, but it is also a medium participating in the reaction. Therefore, when the reaction medium is less, the conductivity is reduced, that is, the internal resistance is increased. When the car battery is dead, the voltage gauge will going down. Battery is an indispensable part of the automobile, which can be divided into traditional lead-acid battery and maintenance free battery. As the battery uses lead calcium alloy as the grid frame, the water decomposition amount generated during charging is less, and the water evaporation amount is also low. In addition, the enclosure adopts a sealed structure, which releases less sulfuric acid gas. Compared with the traditional battery, it has the advantages of no need to add any liquid, long storage time for the wiring pile head, etc.
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