Is it useful to add electrolyte to the old battery? Do you have to discharge the battery before adding water?

It is important to know that the car battery is a kind of wearable part. As the battery ages more and more serious, coupled with the loss of water electrolysis and vaporization during the charging process, it will naturally lead to the gradual decrease of the electrolyte, so it needs to be refilled in time. The electrolyte is out. However, some people question whether it is useful to add electrolyte to the old battery, and whether it can completely solve the problem of battery abnormality.

If the old battery lacks electrolyte, it will not only cause the battery capacity to decrease, but also cause the internal structure to deform. Therefore, in order to avoid these situations, we should fill distilled water in time. Then use 1/10 of the rated charging current to charge until the battery is fully charged. After that, we have to use one-tenth of the rated capacity to discharge until the discharge is finished. Follow this process for three or four cycles to restore the car battery to its original state. But don't use high current, otherwise the consequences will be unimaginable.

Do the batteries have to be discharged before adding water?

In theory, the battery should be fully charged (not discharged) before adding water. Why? It is because when the battery is out of power, the electrolyte level will be much lower than normal. If it is just saturated when the battery is out of power, it will definitely overflow a lot when the battery is charged. So this can explain why the discharge treatment should be carried out before adding water. As for how to fully charge it, we can use common battery chargers on the market to charge, and when fully charged, we can add water.