I have watched at least 50 videos, and this one was perfect, explains everything clearly, shows everything and how to do, no annoying background music or distractions, no tricks, just clear, precise, well layed out explanation. Thank you.

Glad to hear someone explaining what is going on and talking about the procedure and not playing annoying music.

I have tried ALL the methods to revive lead acid batteries over the last 55 years! Some of them helped a little most of them turned the battery into junk! I tried this method on my 3 year old motorcycle battery that lost two cells??? don't know why?? I always charge the battery on a tender for a week when removed in the fall and recharge again in the spring for a week prior to going back into service. I have yard equipment batteries that are 12-15 years old and continue to work like new! When I removed the "do not remove" cap string on the battery, I noticed it was bone dry! I took this procedure 1 step further and added batt acid to just cover the plates. The cells took between 20-30 cc's of acid each!! I used a 2 Amp charger, the start voltage was 10.50 V it stayed there for 3-4 hrs. when I had looked at the meter again the voltage was now 11.75 V it was a steady reading. 4-5 hrs later to my pleasant surprise it showed 13.05 Volts! Over night next morning I had 15.88V. I will tenter charge for a week and check the open ckt voltage after 24 hrs. $11.00 for acid to save a $150.00 battery! Thanks for sharing something that actually WORKS!!

This is, hands down, the absolute best battery maintenance video on the planet. You, sir, have the gift of teaching!

🤩nice final drive 👍for 2 weeks I regenerate 4 gel batteries 12 v/20 ah with the addition of distilled water only, with a desulfator prototype made by me,

Hi, When I was gainfully employed, I maintained emergency services radio communication systems in the Highlands of Scotland. Some remote installations employed 12 and 24v dc solar/wind systems... Here are some tips I learnt the hard way! (when your up a gum tree without a paddle) Most service techs carried a variable 24 volt 10amp bench power supply in their vehicles... When we found a dud 12 v battery that would not charge (open circuit)we would dismantled it as shown in the video... With a multimeter connected to the neg terminal.. the positive meter terminal was connected to a thin screwdriver ..the screwdriver was pushed gently into each hole to touching the cell plates, that should measure around 2volts then the next hole 4 volts and so on... increasing by approx 2 volts each time eventually you will find an open circuit cell (probably dry) top up with distilled water and let it soak for an hour ...Now replace the multi meter with the bench power supply and carry out the same process watching the current meter and adjusting the voltage to find the faulty cell causing the open circuit...Eventually current will flow between the positive and negative terminals...Now connect the variable power supply with a car headlamp bulb in series to limit the current ...Now crank it up to 24volts whilst watching the current meter gradually reducing the voltage to keep the current at around 2amps...Now charge the entire battery at 13.8 volts for a few hours (after topping up all the cells with distilled water) ... Finally replace the rubber caps and cover with a strip of gaffer tape... At the next planned visit we would normally exchange the battery.. PS always wear safety glasses when doing this work!

What a great video. This should win an award and KZfaq creators should reference it as exactly how to convey information effectively. Thanks and good job.

Thank you very much for this. You are the first guy on KZfaq that I have seen to come up with real science to charge an old battery.

Video recording was good, non of that stupid moving camera everywhere. Explanation was good, content was great. You actually did a capacity test and a load test. Great video. I gave you a thumbs up

You have done great in this video.Please do a video on how to setup a battery reconditioning business:advice on the right tools and required materials necessary for the business

When you are finished. Build and use the Bedini "Energizer" to maintain the batteries for years as Sulfate is removed by Pulse charging them via back EMF. Thank you for sharing VUAECO. May you be blessed.

Thank you. Chemistry and circuit diagrams. Explains it to intelligent humans so we can make INFORMED decisions. Much better than a numpty in a garage guessing what he's doing.

Great video. The chemistry explanation helps with understanding why simply adding distilled water can't rejuvenate a dried out battery that won't take any charge. I loved the tests at the end too!

I am a Retired Avionics Tech. I forgot more than I learned about Electronics these days. But seriously you have expertly explained the method to keep batteries going and going. You expertly put the correct information that is needed. Now if I can ONLY figure out how to revive an AGM Lead Battery now, LOL The many fires and being not good for Cold Climates without a heat source for them, that the Lithium's are famous for, has led me back to Lead, LOL

This is how you make a good informative video, based on science, facts and showing receipts. Thank you!

It worked! I'd had all but given up on an old SLA.....but following these steps brought it back to life. I added more electrolyte as it charged - the amps went from 0.00 to 0.01 ......and the next morning 0.13.....and before I knew it, the thing was holding 12v. Thanks

What a fantastic video! It includes a thorough explanation, tutorial, and test. You have a great set of tools as well.

Best battery recovery video I've ever seen, and now I know why none of the OTHER videos left me with a working battery.

God, that swamp of awful videos on this topic is deep. This video is the one you want, ignore all the others. Great work sir and thanks for making a to the point and factual video.

Finale made me smile. At last something that works without too much fuss & bother.

OMG. THAT WAS TOTALLY FULFILLING SEEING THAT ALL THAT WAS FOR YOUR KID. BUT HIM DOING WHEELIES ON 48V WAS AWESOME!!!!!!

Your son was learning how to ride a wheelie right before your eyes! Cool

I brought up a dead Costco interstate with a 20watt solar panel and the exact same solar charge controller used in this video connected directly to the battery. I did add some distilled water. The solar charge controller will charge the battery at exactly .1 volt (1/10 of a volt) higher than whatever charge is on the battery. I think it is better than using another battery to parallel charge. It did take over a week, but this 5 yr old battery was completey restored to something a only little less than new operating power. I also had a brand new non-Interstate car battery and it would only rate between 11.9 V- 12.2V depending how recently I drove the car. When brand new I treated that particular brand new battery to some extra electrolyte in the form of sodium sulfate salt (Na2SO4) which is supposed to quadraple battery life. This didn't make a difference in the performance of the battery with normal car alternator charging. Info from Turquoise Energy did tell me to cycle the battery, but lead acid are not deep cycle and I just relied on the alternator. (Although this sodium sulfate salt chemical is what they use on deep cycle lead acid). It is only when I left a 25w solar panel/$12 charge controller on the battery for a month or more, did I experience sustained higher than average charge levels. In fact, after that, when the car sat for 2 month undriven and uncharged in any way during covid and rain with the battery disconnected, the battery still held 12.5 volts: better than new!! Sulfation is reversible, corrosion is not. Extra electrolyte might help but, it is the trickle charge at the right voltage that makes the big difference. (It is not advised to put sodium sulfate salt into an old battery as it might cause bits to dislodge and short out the battery)

Excellent video!! Thank you. The main ingredient to this is patience, you have already provided the knowledge. Thank you again.

Amazed at the complete explanation of battery maintenance. Nice job.

I can confirm that this worked for me on my grandsons TTR110 bike battery. It was totally dead for a long time, would not take a charge. After doing this it changed and starts the bike just fine. Thanks for making this great video.

FINALLY SOMEONE EXPLAINED IT CORRECTLY! THANK YOU!!

Thanks for this! I was about to throw out 2 batteries I replaced from my UPS and realized I can revive them, thanks to you!

🏆Best battery video on KZfaq🏆

God bless you, one of the most informative and helpful videos I have ever seen, you are a great teacher.

This is the best video on YT about lead acid batteries refurbishing.thanks

The chemistry of how battery functions and deteriates was very well explained. Very helpful. Not so sure if battery desulfation process will be successful. A battery recoverable capability varies.

Man you're awesome. I wish I had people like you around when i was younger. Now I'm 41 crash coursing battery tech. Batteries have always interested me. Supposedly in the future we are supposed to go black. No wifi no cell. No radio. No electric. So a person should definitely learn about batteries

Amazing video: Science, Practical & Fun filled. All the ingredients of a successful online content.... Kudos.

This is the real way to restore a dead battery. Excellent video sir🇱🇷✌️

Excellent job. I particularly like your parallel charge concept.

Good tips. I have a 5 AH battery which was bone dry and zero volts. Unknown age. Popped it open and added 1.25 mL acid per cell + water to top it off. Shook it around a bit to mix. Almost immediately it showed 7.5v. Now on a one amp trickle charger and slowly climbing in the charge current. Started out around 50 mA and already at 250 mA after running a while. The little trickle charger appears to be working fine without brute force jumpstart method required.

This vid is a one stop educational step to reviving a battery. Well done. Get someone to give you a pat on the back buddy.

I ALWAYS ADDED WATER TO MY SCOUTER BATTERY TO REVIVE IT A BIT. BUT WHAT I REALLY LIKED IN THIS THIS VIDEO IS THE 30% , 2 ML H2SO4 TO THE WATER. NEVER THOUGHT IT WOULD NEED ACID. THANKS FOR THE TIP. SUBSCRIBED.

I had no idea that I could try charging the battery with another good battery in parallel. If I ever have a battery that does not want to charge I will try that. thank you very much Sir

Very good explanation. I'm going to try this I probably have 12 old used batteries I can revive and use with my solar array.

I've watched a few similar vids and found the presentation of this one is superb in comparison

You also can use 18 volts at 500 nillamp to desulphate the plates this process takes 20 to 24 hours still using distilled water leaving the caps off to reduce pressure buld up.

You have made an excellent, science based, no bullshit video. Thank you very much! Subbing based on this video alone.

I like this guy patience it is a virtue. That parallel charging is how I saved my very expensive BMW battery connected together with a good battery put it on a charger overnight boom hold voltage before you can charge it all day all night it would not hold voltage past 10 volts now 12.56 solid

This is one of the best videos on restoring a battery I have seen. I play around with restoring battery's because I have so many thing that use them. I,m going to try this. I subscribed to your channel, & thank you.

Ya i agree with what they all said, very well done video. clear, precise instructions and you actually tested them after!!! Love it! Thanks for putting out such useful content for others to see.

Thanks! I'll be shopping for some sulfuric acid this week! I have a couple batteries that need some help.

Love this guy. I learned alot. Hope he making bank off his great videos.

You are a fucking G my man, found you through the tire bead break video but this is something I need to do as well. Love your accent too, reminds me of my good friend’s dad 😇

Brilliant explanation and very informative. Best video on battery restoration thus far!!

I'd like to see a quick list below the video discussing the parts/devices needed or used to recondition the batteries.

seeing that kid enjoyed the extra kick from the amps, awesome!

Excellent video. Very valuable information. I tried this process on almost a dead battery. I had to use trickle charger instead a big battery in parallel. It took about a week for first full charge. Battery has recovered. I am going to try this process on a very big battery.

Great video man! Thank you for showing the chemistry as people like to “theorize” fixes too much. Right now I’m working on multiple batteries that I’ve managed to desulfate with pulse currents, but I’m going to try and find some new Sulfuric acid which is hard to find around here. Thanks again! 💪👍🎉

Sorry, just read my post and I said 2 ml for 10 A/h battery, that was per cell. Thanks again Colin

I'm impressed. 👏👏👏 for a change I can make sense of the battery restore process. Thank you 👌

Excellent tutorial. Great detail and technical explanations. Summary at 13:24

First of all, having watched about 10 videos on this topic, this one is by far the best. I have two 12v lead acid batteries from an old Craftsman trimmer which has been in my shed for over 10 years, not used. They both shows ~5v, using a trickle charger did not work. I followed the process from this video. The first battery, after adding acid and water, fairly quickly went up to around 8v. After that I tried a trickle charger but it still refused to charge it. So I connected it to a car jumper which has a little over 12v. With that, I was able to get the battery to around 10.7v, the trickle charger is still failing. I will continue tomorrow. Also, I didn't see any bubbling but there was a little spill over of the liquid from the cells. I haven't tried the second battery yet. If anyone has any suggestions, would appreciate it. As of now I'm optimistic. Again, thanks! Update: Next morning the battery show 10.3v so it lost a little. I also noticed in 2-3 cells the water level was low so I added more. Now connected the trickle charger and it showed a steady green which should mean that the battery is fully charged, but it is not. I left it on the trickle charger but after 5-6 min it turned the red light. The battery is still at over 10v. This is strange.

Very good video! I have some suggestions: 1. Don't fill the cell until you can see liquid water in the cells. This is an Absorbent Glass Mat (AGM) construction which has a fiberglass mat covering the plates. The mats are meant to be about 98% saturated with water, so you should fill them until the mats look damp (wet and shiny when you shine a flashlight into the hole), but not enough to have actual liquid water in the space around the plates 2. Water level always rises when the lead acid battery is charged. So when filling a sulphated battery fill it to the bare minimum, charge it so the water level rises, then top up to the correct level (if necessary) after charging 3. It was interesting that you added battery acid. In theory you should be able to use just distilled water, because the lead sulphate partially dissolved to become sulfuric acid.

WORKS !!! Thanks a lot. Really the best one out there. Parallel Charging !!!! YES!!!

Hands down the best battery rehydrating video i've seen yet :)

Beautifully presented, thank you so much! Loved the ending with your son hahaha!

This was very helpful. Thank you for putting this on youtube. I have watched a bunch of videos on rejuvenating batteries. Yours was one of the most useful And helpful. I appreciate it. Thank you!

Congratulations. Good explanations and diagrams. Excellent, steady camera views. Very good video! Thank you. Could use a bit more explanation, early in the video, to know when the process is completed.

Great video ive been getting free sla batteries like in your video from UPS units from a friend. Some have decent voltage some didn't. I watched other videos and was just useing distilled water. The results were very disapointing and furstrating. Thankyou for education. I just got my last batch of free batteries as my friend got a different job so no more free one. So perfect timing to find this. I recycled others incouldnt fix with the acid less process. I'm off the grid so this info is priceless to me. Side note I like seeing the kids electric vehicals I put two 24volt hoverboard batteries ran in parallel in my daughter's mini electric dirtbike it was to much fun to watch. Might try in series. Thankyou sir for the great video.

Wow. I have the same powerwheel painted the exact same as yours! Crazy!

So interesting , I was told years ago that batteries can be recovered with a little care . This came from a man that was a former sub mariner and when first started to use a motor cycle because mine hade no battery so he recovered a old one of his .

I love the chemistry lesson. To know the why is part of knowing the how. Thank you.

The best video i ever seen for reviving acid battery... I'll try mine Many Thanks 👍👍👍

Great vid,want test 2 similar batteries,hope I get same results,might try connecting it to work van as I drive during the week.

I agree johnathan ..he has explained in a way that's easy to understand more about what the problem is and what is going on thru every step in what ends up being very informative and helpful video. Most people either expect you to just know what they are doing and why and leave you with very little useful information ...or they are to technical. To follow....or they dumb it down so much it's ridiculous ....i am proud you said something ...i am quite impressed with his video and would like to say thank you.

I have revived them with a little Alum solution and distilled water. Put a 100w lamp with streight AC! till lamp lights brightly, then charge normally. The AC cracks the sulfate and allows it to accept a charge. The alum causes the electrolyte to be more conductive and makes the sulfate deposit more porus.

Thank you for your kind and patient video and/or explanation.

lol the shot of KAISER just a discreet way of telling people they best be careful

This is the best video I’ve watched on this subject. You explained everything so clearly. Got a sub here.

'Yesn't", lol. I haven't heard that term since primary school. Very informative video.

We tried this in series with these batteries and it worked

You are an illustrative tutor. Keep it up

I did something like this last year to Lithium Ion batteries... its works

Thanks for all the explanation. I might not get it but all good. I still haven’t had the guts to try this yet. But every couple of years I gotta buy batteries for my two project cars. Gonna try this method this year.

It is in fact October 30th 2021 exactly 1 year later I just thought that was cool. I’d find it on this day. Also great video.

I was searching for an explanation on what's going on inside the battery chemically. I just don't understand the Epsom salt deal. Thanks for the video. I subscribed, even without knowing what your channel is about.

Superb! Great explanation and tech. I like the solar charger too. Good work!

What an excellent tutorial! You are a smart man. Thank you for sharing your knowledge. 😄

That's REAL KNOWLEDGE and prefessionality in DIY works, really happy to follow your channel. Keep it up!

Great job on the video, I will be following your recipe and I'm hoping to have the same results even though there is no guarantees. Thank you.

this guy is an absolute genius

Great video ,Thank you for explaining in detail. Very helpful.

I am in the process of trying to revive an old sealed lawnmower battery, I found this very useful, the battery is charging now. It may or may not work out but it's interesting to try. I added 5 ml of battery acid and then over the plates with distilled water. I'm using a battery charger with automatic cut off when the battery is charged.... if it makes it. Thanks for the information.

I don't know where you're from but your accent reminds me of Pauly Fuemana, the Singer from OMC that did the song How Bizarre. Great video by the way. I was just in the shop about to recycle an old SLA battery from my generator and I was like, this thing's only been used half a dozen times. I bet it just dried out. I'm gonna try this technique and see if I can bring it back around.

Great explanation, can't wait to try this! I also have a Victron Blue Smart IP22 Charger which would attempt to charge even completely discharged battery. I tested it already on my 18ah 12v battery that has a shorted cell the voltage drops to 10.4v soon after charging but it can be used and recharged. See what happens.

Straightforward no bullshit video. Thumbs up.

Ive done this parallel charge on a smaller scale with 18650 flashlight batteries so i know for sure 👍 it works

Thank you for this video..I’ve been looking for exactly this for a long time!

This is one of the best explained videos I have seen...thank you very much!!!

EXCELLENT tutorial. Thank you!

GREAT VIDEO! I would totally do this. But I do not have a nice charger like that, the acid, or nearly as much patience as this guy has to save 50 bucks lol

Amazing video and detailed explanation!

Great, clear explanation. Thanks!