How to PROPERLY Recover and Recondition a Sulfated Battery

What are you thoughts on the process of running high amperage (200+) from a starter mode on charger in 20 minute intervals ... does that help/hurt? There is another video I saw about doing that process to batters to revive ... then I assume charging through this process?

good video like olways but I disagree with you on your last statement, these LA batteries will get week after 2 or 3 years even if you keep them fully charged

I have reconditioned several batteries And add a step That seems like a good idea to me. Fresh off the charger, I shake the battery vigorously. My thinking is The sloshing helps clean and Mixes the electrolyte evenly throughout The Fluid.
I first tried this with a stubborn battery that would not take a charge and it worked.

Man, I can watch this video over and over! Thanks so much for sharing!

What is the purpose of resistor?? Can I use 6.8ohm one??

The internet is full of lead acid recovery methods and pulsing desulphator circuits etc. It simply depends on the state of the cells - if they are really hard damaged, the lead structure internally is broken or partly broken - there is no way to recover the battery. In other cases (soft desulphation) it might work! But you definetly need the resistor in your first circuit, if you start the process and watch it - what you always should do. I prefer a lab-power supply with 0-30 V and at least 10 Amps for charging. You can even start with much higher voltage if the battery doesn't take a charge. When the current ramps up you just lower the voltage! Final word: lead acid is old technology - switch to Li-ion, best LiFePO - you have real 100% cycles and up to 5000 Cycle life!

The simple solution would be to CUT the top of the battery off, remove the plates and go after them with a wire brush.

Thank you for this tutorial Knurlgnar
I tested my car battery from my car (varta d59) with a conductance tester that calculates the amps the battery puts out based on its internal resistance, it tested at 388A out of 540a. I made some tiny 1mm holes on the top and used a syringe to add a bit of distilled water in it each cell, all of them had the plates covered but each one was at a different level. I then put it in an equalising charge at 16 volts for 24 hours, then i did a discharge with an h4 headlight bulb and after recharging it it went to 432A. I just finished the second discharge cycle and i am waiting for it to charge to test again.

Thanks man, well done!

Do you have it on the 6volt setting or 12volt?

I had a lead acid battery in my boat for 19 years and was still going strong .
Replaced it cos it was probably time .
I just looked after it.

What a crock of $#!T!!!
$60 for a car battery???????
😂😊😅

200 watts at 110 volts is not 20 amps

Thanks so much for the information! This is a fantastic tutorial as are your other videos on reconditioning batteries. I was struggling with getting severely imbalanced SLA Group 4D batteries back to health, (they were only 6 months old and in light cycle use) and your videos pointed me in the correct direction.

What I found, and what helped me: The key is to not stop at the voltage of the 20 hour rate, but make sure the resting voltage after discharge is at the 20 hour rate. I had tried to recondition stopping at the 20 hour rate (10.5 volts in my case) but that did not work. my batteries were not improving. I tried slow recharge with 2 ohm resistor for a week, recharge at 1 volt over the upper limit (condition equalization charge) for 24 hours, charge at 14.8 volts for 2 days, 40 amps for 10 hours, nothing worked. Then I thought about what you said about referencing the spec sheet in one of your reconditioning videos and getting amps through the battery - I'm theoretically putting a ton of amps back into the battery, its not holding the charge - it wasn't even going to heat, it was just doing nothing..., so maybe I'm not discharging enough 10.5 and stopping is just not enough? That was the case. After complete discharge cycles so my resting voltage was at the 20 hour rate spec, the batteries started to improve with the reconditioning you outline.

I had 10 out of 26 Group 4D batteries like this, so far I've got 4 recovering, 2 back in service. I read up on how imbalances that ultimately lead to sulfation like this can happen, turns out it is manufacturing defects! Improper ratios of the lead + active materials (tin/calcium/etc) during manufacturing causes the internal cells to become imbalanced when lightly discharged and slowly recharged. (however the manufacturer of these batteries will not refund me or give me replacements, soooo I won't ever purchase from them again) but your methodology works to bring them back into balance and back into service. I just hope I don't have to do this too often, because it is ridiculously time consuming :)

Thanks for your videos! Useful and accurate information that solved my problem!

What in the world is pulse charging? I don't have an old ancient battery charger can I use my welding machine. Oops 9 years ago you may have lost interest.

I did the baking soda flush method on my tractor battery, refilled with distilled, put on trickle charger for a few,days, and it's still starting 2 years hence.
Ever hear of the welder method of boiling it? Imma trying that next on my mower; failing me now.

CAn this method work in GEL type battery?

Is the idea behind the method to purposely over-charge the battery, thereby causing lots of bubbles to form on the lead plates in order to use the bubbles to knock the sulfate crystals off the lead plates?

Pulse charging may not be good enough to recover dead batteries but it has helped me rejuvenate weak car batteries. I have a top don 8 amp charger w/pulse feature.

Why is is the sound not working on these videos