Many car owners are faced with the fact that when charging, the battery boils. This does not bother anyone, but some, on the contrary, turn off the charger (charger). There are several relevant ways on how you can restore battery power to 100%. In this case, bubbles may be absent or present. Let's figure out how to charge the battery, and whether this phenomenon should occur.
Electrolyte boiling: normal or not?
So, after you connect the charger to the battery terminals, you notice that several or all of the banks that contain the liquid begin to behave unstably. This is quite normal, but there are some nuances. If you just connected the battery and found boiling several cans, then such a device can be thrown away. This phenomenon suggests that there are closed plates and it is unlikely that there will be any sense with such a battery.
If you notice that the battery is boiling when charging, then you do not need to be scared - this is normal. In fact, this is not a boil. The formation of bubbles in banks indicates that explosive gas is released, in other words, electrolysis occurs. In this state, the electrolyte has a normal temperature and does not rise to the maximum maximum (above 45 degrees Celsius). Let's see why the bubbles appear.
Why is the battery boiling?
As a rule, gas begins to be released when the battery is already fully charged, and now you will understand why. Since we have a limited capacity, we cannot endlessly accumulate electrical energy stored in a chemical form. Therefore, when the battery is fully charged, all incoming energy is converted to explosive gas.
You must understand that under no circumstances is it recommended to charge a maintenance-free battery with a clogged exhaust pipe. This is due to the fact that the battery is boiling, and the energy cannot leave, since the lid is closed. More than once there were cases when the banks simply broke the batteries. Nevertheless, it is still possible to recharge, but you should try not to charge the battery by more than 80-90% of the maximum. Now you know that the process of the appearance of bubbles is quite normal. As soon as they begin to form, you need to turn off the charger, after which you can install the battery in place.
Preparatory work before recharging
Before starting the process, you need to remove the battery and put it on a horizontal surface. It is advisable that everything be done in a ventilated room, since toxic, besides explosive gas is released. Next, you need to unscrew all the banks (this applies to the serviced batteries). This can be done with a large flat screwdriver, sometimes even with your hands. We should see the electrolyte: if its level is lower than usual, then we add water (discsilates). After you have completely set the normal level, you can connect the charger.
The main thing here is not to mix it up. We connect the plus memory to the plus terminal, well, and minus - respectively. The charger has two wires: red and black, “+” and “-”. The battery is charging, we are observing. If the battery capacity is 60 Ah, and the current is 6 amperes, then 10 hours is enough to fully charge the device. But note that if the battery boils while charging and it started at the very beginning, then this is a clear signal that it is necessary to reduce the current. This way you can avoid damage. Nevertheless, you need to understand that the battery should boil when charging, but not too intensely.
A little bit about proper charging
Modern batteries use a current equal to 1/10 of the total volume. So, a 12V 60 Ah battery needs to be charged with a current of not more than 6 amperes. But this method is not always used. For example, the exception is a full battery drain. In this case, use a reduced voltage, approximately 2 amperes. Occasionally, a forced battery charging method is used. It should be noted that this has a very negative effect on the device, since we use a current equal to 60-70% of the total capacity. If the battery is 60 Ah, then we charge at about 40-45 amperes. There is a high probability that the temperature of the electrolyte rises to 45 degrees Celsius, in which case the process must be stopped.
There is also a leveling method. In some cases, it is most preferable, since it allows you to completely restore the active mass of the battery. The current strength in this case is 0.1 amperes. Therefore, recharging in this way will take a lot of time, but this will not affect the functionality of the device.
A few important points
Not everyone knows that after the battery begins to boil, it can be charged for some more time. As practice shows, on average, it is 2-3 hours. After that, the battery can be considered completely ready for use. If, when charging the battery, the electrolyte boils for a longer time, then this will lead to oversaturation and further destruction of the device. You can also check the density of the electrolyte, if it is in the range of 1.28, then the battery is charged, if lower, then not yet.
Do not forget that with prolonged release of bubbles, the electrolyte gradually boils away, so it is advisable to disconnect the battery from the charger in time. It is also strongly not recommended to place the battery near open sources of fire for obvious reasons. It is advisable that charging is carried out indoors so that rain or dirt does not get on the battery. I would also like to say that you should not place the battery on unstable surfaces, especially when the charging process is in progress.
Conclusion
After reading this article, you should get a general idea of why bubbles appear. As already noted above, this is a completely normal phenomenon, but the process must be controlled and prevent overcharging. The process of electrolysis of electrolyte water is observed when charging with direct current. If you use the equalization method, then there may not be bubbles. As for the forced method, then, on the contrary, boiling may be too intense. In conclusion, I would like to say that all the requirements and rules described in this article must be observed, and then everything will be in order. If the battery boils while charging, then this is a signal that the battery is almost charged and it cannot be left in this state at night, as this can lead to negative consequences.