Lead-acid batteries are used in various industries, including cars, and they are available in the market with different voltages and amperages.
For example, you can see these types of batteries in some centers, including telecommunications and electricity companies
Some of them are available in voltages of 2 volts and in different amperages, for example, from 350 ampere hours to 2000 ampere hours.
Or it is available in cars with a voltage of 12 volts and a current of, for example, 65 or 80 or 120 ampere hours.
It should be noted that the battery companies themselves have implemented this instruction
In the first step, pour acid water with a concentration of 1.260 grams per cubic centimeter into the battery cells
(it should be placed about one centimeter above the battery plates)
After filling all the cells, be sure to rest the battery for 6 hours so that the acid water penetrates its plates completely.
We have three types of charging
The first is the initial charge, which is done with a voltage of 2.7 volts for each cell
The second is recharging, which is 2.3 to 2.4 volts for each battery cell
This charge is for when our battery is discharged to 50% and we want to charge it again
The third is the maintenance charge and it is used when our battery remains in a stationary state
It means we don’t use it and its voltage is 2.22 volts for each battery cell
Of course, our goal here is the initial charge
Let’s assume that our battery is a car battery and has 6 cells, and as a result, the voltage required for its initial charge is equal to 16.2 volts.
Of course, it should be noted that if we connect the same voltage to the battery, it will draw a lot of current from our charger
which seriously damages the battery, so we must limit the current and use current limiters
If your charger does not have a current limiter, you can lower the voltage a little, that is, play with the voltage factor.
In any case, your charging current should not exceed one half of ten percent of the rated current.
In the first case, we charge the battery for 54 hours with half ten percent of the rated current (one twentieth).
That is, if your battery is 100 amps per hour, your charging current should be 5 amps.
After 54 hours, we rest the battery for 2 hours
Later, we charge again for 20 hours at 0.4I10 (four tenths of ten percent of rated current).
After this time, the batteries should be discharged until the voltage of each cell reaches 1.85 volts (we used to charge them, but now we discharge them).
Discharge is done with a current of half ten percent of the rated current (one twentieth).
After this operation, the batteries should be charged for 30 hours with a current of half ten percent of the nominal current, that is, with 5 amps
And this is the final charge (this charge is often done in the battery factory)
Of course, the batteries that are outside were charged in the factory and acid water was poured inside them
And some batteries are also dry, these batteries were charged in the factory and only the acid water was drained from them.
And to use it, you have to pour acid water into them and recharge it (note that the initial charging is often done in the factory)
So when you buy a dry battery from a battery store, whether it is dry or contains acid water
You don’t need to charge it first, but you must charge it again
That is, apply 2.3 to 2.4 volts per battery cell
with a current of half ten percent of the nominal current (one twentieth) until it reaches the gassing voltage and the concentration of each cell is equal to 1.260
In general, it is enough to recharge for about 10 hours with a current of half ten percent of the rated current
When you pour acid water into the battery, its concentration drops sharply, and when fully charged, its concentration reaches 1.260.
Of course, it should be noted that the acid water concentration of car batteries should be around 1.260 to 1.270.
