Battery desulfator from junk

Electronics / DIY electronics 39 819 9

Hi all! It is quite possible to make a simple desulfator from old and unnecessary things in about 15 minutes, if, of course, you know what to make and from what. Any normal radio amateur has a lot of all kinds of electronic junk. And if you scratch the bottom of the barrel, you can find everything you need. In principle, everything is accessible and interchangeable.
So, lead batteries are susceptible to sulfation. This is a process in which the battery plates are coated with sulfate. This phenomenon causes the battery to deteriorate in terms of capacity and current.
In order to get rid of sulfate deposits, I will expose the battery to high voltage at high frequency.

I will take the high voltage from the power supply board for the mercury lamp of the document scanner. I won’t show you how to find it in the scanner and connect it, since this is individual for each scanner.

I connect a copper plate covered with an insulator at the edges to the tip of one of the high-voltage wires. And we screw the second high-voltage wire to the battery terminal.

Let's move on to battery recovery

After this, we supply power to the board with 12 Volts. Attention! Dangerous voltage!

Now you need to clamp the plate on the second terminal of the battery so that there is no direct contact. And the current passed through the shortest possible spark arc.

To get the best result it is necessary. Apply high voltage to the battery for 30 minutes to 3 hours. Then turn off this design and put the battery on charge. Then unload and repeat all over again.
Repeat until the battery capacity increases.
You can also hit with a shaker. This technique is also applicable to ni-CD batteries.

Watch the video

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Comments (9)

#1 A.G. Guests 30 August 2018 18:39
2

And how many batteries have been restored this way?
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#2 vit152 Guests August 31, 2018 07:32
0

2 pieces and both from delta
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#3 Vitaly Guests 31 August 2018 16:39
0

Did you see the plaque on the plates yourself or did you just assume that it was there?
And what about the chemistry/physics of the process? Is there a scientific basis for the method?
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#4 Guest Vladimir Guests 1 September 2018 22:53
0

It’s nonsense and a complicated process, and the result is questionable. The best way to desulfate a battery is to use an automatic charger by fully charging and discharging with a low current to approximately 11.8 volts, then charging again. A few cycles and the battery is in good condition again.
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1. #5 ro Guests 1 July 2022 19:25
  0
  
  Usually the main question is that repeated deposition and reprecipitation of the constituent deposits of PbO2 and PbSO4 plates disrupts the very structure of the material filling the plate - in some places areas appear that are not in contact with the electrode (detachment), or zones containing difficult-to-react thermodynamically stable intergrowths of various crystalline forms ( alpha and beta modifications), you can somewhat reverse the process with all sorts of pulsating currents, by charging with increased voltage (not thousands of times), but if there is already rot left from the plates and they really fell apart and the lead of the electrode itself has already reacted significantly, this will not help much. In addition, sometimes the wear of the plates is so great that they fall off the holder entirely. If there were any real method of restoring old batteries through simple manipulations with electricity, then new batteries would not need to be made and no one would buy them.
  
  Answer
#6 Guest Evgeniy Guests September 4, 2018 02:12
4

The simplest “desulfator” is a charger with a light bulb connected in parallel. It is selected so that its operating current is five to ten times less than the charging current. There is a subtlety - there should not be large capacitors in the charging circuit. It is also advisable to have one diode in the rectifier rather than a bridge. That is, charging must be carried out with a pulsed current.And in the pauses between pulses, the battery is discharged through the light bulb.
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#7 Peter Guests March 12, 2019 07:39
1

what is suitable instead of "copper plate"?
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#8 Guest Sergey Guests 6 June 2019 16:33
2

I’ve been working on batteries for 40 years. What a waste of people’s imagination!
It’s hard to read textbooks!!!
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#9 A.A. Guests June 9, 2019 02:49
1

You can also drain the acid instead of electric shock, hit it with a sledgehammer and buy a new one. Moreover, the price of such batteries is low. But it’s very easy to get a battery explosion in this way (shock with electric shock) + on top of that, you’ll be in acid to the very top. In any acid or alkaline battery There is an explosive gas present, which, when sparked, causes the battery cans to rupture. There have been cases when, after the usual standard recharging, the batteries exploded when they were already completely disconnected from the current supply to them. The plates themselves in the cans simply shorted.
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