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Automotive electricity

Auto battery indicates green but is discharged

mario17farias
hace 6 años
hace 6 años
Hello everyone, I have this problem with the battery of my car, it is a toyota corona of the year 77, I bought the battery of the REIFORT brand that is made in Brazil exactly 1 year ago, the issue is that a few days ago, when I wanted to start the vehicle, just to a click, click like the battery did not have strength, I measured it with the multimeter and it marked 12.3V I took it out and removed the plugs to load distilled water, then I left it charging a few hours and proceeded to Again to try to start it but it gives me the same problem, I re-measured the battery and had 12.1V. On youtube I saw a video of how they measured the battery cell by cell with multimeter and with the reference voltages they should have, I did the same and when measuring the first cell I have a reading of 0.05mv when I should have 2.1V for each cell according to the video, well I checked the other cells and indeed they had between 2.0 and 2.1V is the first cell that gives me less than the specified voltage, the funny thing is that the battery has a charge indicator, and this one marks me that it is in green, no longer I know what else it could be, will it be that the battery will no longer serve me? I hope you can give me a hand with this, thanks. Regards.
Edurau
Edurau
835
hace 6 años

Hello, between what points did you measure the first cell? Should it be between the output terminal of the first cell and the entry point of the second cell, and so on, or, with a specially designed tester, the resistance of each cell is measured with the same criteria, that would indicate if one is short, or, it has interrupted some internal connection bridge, luck

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mario17farias
hace 6 años

Yes, I did it as you are indicating. I also did it by putting the tip of the multimeter through one of the battery terminals and the other end in each of the cells and as I mentioned, the first cell already gave me a bad reading. And it's just a cell.

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Edurau
Edurau
835
hace 6 años

Then that cell is short-circuited, therefore, the repair, if it has one, must be in the hands of a specialist. Luck, (good or bad, depends).

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Elio Maffei
hace 6 años

No friend, it is not short, if it were short it would only mark 10/11 volts, it is interrupted. with a voltage of 10/11 volts the car would treat or ignite but the other plates in the battery would bend

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jorgedeclaypole1
hace 6 años
hace 6 años
To know if the battery is charged, do not measure with a tester, It must be measured by applying a load that simulates the consumption of a starter. As they are measured with special devices, take her to a battery workshop that has instruments for that function. Batteries or batteries are always measured with connected load. They can also be measured with a densimeter, to see the situation of each cell, but the best and practical is to take it to the right place. The average battery life is 2 to 3 years
mario17farias
hace 6 años

Well, I wanted to see if I could do something that could help me with this, is that here in my country many of those places where they call themselves a battery workshop, the first thing they will tell me is that they are already dead, and they will want to sell me a new one with an exchange of this, just for that reason I posted the query, to avoid being teased.

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JOSE MIGUEL SIRGO PASCUAL
hace 6 años

Something similar happened to me with a battery that had a scarce year and I regret to tell you that you can take it for granted because what has happened is that one of the cells has degraded.
What I did with mine was to cut the plastic from the bad cell and bypass it to have it in my workshop to use it with a battery drill that broke the battery cartridge and also serves to use with an emergency light in case of blackout .

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mario17farias
hace 6 años

Then there is nothing else to do with a new one?

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Elio Maffei
hace 6 años
hace 6 años
friend, with everything you did in the drums, you know that it is struck, bad. The glass that measured you '0 I don't know what else, it is the one that is interrupted, the battery will mark you 12 or 13 volts, but it is a dummy, false charge. indeed, all the other glasses are loaded but not the one that does not mark because it is interrupted. As they told you, the batteries are tested with a special voltmeter that puts aside a resistor to discharge the battery and see where it marks the needle of the device, indicating the integrity or less of the battery I think you will have to buy a new one.
mario17farias
hace 6 años

Thanks I think everything points to that, I just wanted to be sure of that as I said before, I don't want to be teased.

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mario17farias
hace 6 años

Another thing, what would be the cause of the cell being damaged? I say to mention a few.

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Elio Maffei
hace 6 años

The reason may be the defective battery cell, lack of water to the required level or overload because of the alternator that is not regulating the charge well and sends more and that can cause the weaker bridge to open, the water will evaporate and do not pass the amperage to start the car even if the voltage does not drop, it will remain between 12/13 volts. That's why I marked you voltage but didn't start the car

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mario17farias
hace 6 años
hace 6 años
Hello friends I have a new data regarding the problem that I exposed at the beginning, it turns out that when insisting with the start, after several clicks that it does, as it suddenly reacts and spins for the march, I thought that maybe it could be the mechanism of the ignition key but I did some tests and discarded them, then what I did was directly took the solenoid cable and bridged it with the corresponding one to simulate the march as if I was going to do it with the key but it does the same to me click nothing more, I clarify that I already tested the starter motor outside the car with the same battery and it works well, not with the force that a well-charged battery should have but as an extra data I charged it again and this time when it started, I put the multimeter to see if it lowered the voltage, to my surprise, when it starts, it clicks but the voltage only drops a little, that is, type 11.5V approx. Sorry to write in proposed solutions but the whole comment did not fit in the other section, thanks
Elio Maffei
hace 6 años

friend if you think the battery is fine, then if the boot when you connect it to the battery just clicks, then try it directly without the automatic. If the starter turns and ejects the bendy hard then it is the automatic that is not making good contact and does not give power and does not turn the harness or is deficient. fix the automatic starter and to avoid that next time send another external automatic to help the arra

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mario17farias
hace 6 años

That is the issue, when I tried it out of the battery, it seemed to me that I did not have enough strength to start, what catches my attention as I said before is that insisting that it suddenly seems that in some way or battery or the mechanism were going to work well and I was running, I already ruled out that it is the mechanism of the key because with the multimeter the bridge makes me well, I think that in the end I will have to lean over the battery but with doubts, since I put it one borrowed and does the same to me unless they have the same problem (batteries).

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