Category: battery reconditioning business

Bring Dead Lead Acid Battery To Live Again: 4 Steps

Today we will learn how to bring dead sealed lead acid battery to live again this method i tried with alot of dead and expired batteries and 90% of them back to work again P.S : this method may be not bring the battery to full performance of the original condition but at my rate  the battery will work for 50%~70% of it. you need : – 3cm syringe – voltmeter or multimeter – battery charger or power supply – crocodile cords ‘used with PSU ‘ – Distilled water For Safety : use goggles and chemical gloves don’t touch the water came out the battery it’s acid

in sealed battery we will find cover on the top of the battery just remove it by little flat screw driver like photo when finish we will find 3 holes covered by rubber caps now we have to remove this caps too. ok now we will measure volts of this battery on my battery it’s 0.76 volts only. that’s mean the battery is completely dry from inside

we need in this step to fill the battery with Distilled water to activate the acid again so refill it by syringe few time until the water come out from all holes  and measure the voltage u will find it increased by mVolts that’s good if not don’t worry

after filling the battery with the water we need to make sure it’s mixed with dried acid inside the battery to reactivate it again so first we will charge it with 12 volts DC ‘i’m using ATX PSU ‘ output is 10Amps u can use any charger 12V in maximum 9V in minimum ok now wait 5min until u see bubbles come out from the holes. if no bubbles come from any of 3 holes u have to reverse negative and positive and wait 1~3min At Maximum (it’s Dangerous step don’t leave the battery in this condition alone) ok now u must see bubbles come out from holes too fast like boiling cut off the power immediately and reconnect  negative and positive right again

now pull the wasted water from the top of 3 holes by the syringe and let the battery charging Don’t cover holes until it charge to 6.9V u should check it every 1 hour then dry it out by tissue and cover every thing Congratulations ur battery is working again feel free to ask me? sorry about my bad english!!

I tried this method with copmpletely DRY 12 V/7A batttery.(No liquid inside). Before trying I measured 0,46V from battery. Then I filled all cells with only distilled water(no acid used). Then remeasured: 0,34V. Next I tried to charge the battery by a China made recharger, but it is mcu controlled and did not charge. So I tried to charge it with an adaptor. But again no charge. Because there is only distilled water inside battery and distilled water is pure, no minerals inside, and it is a strong water-resistant. I think to start desulphate battery fiilling only with distilled water is not good idea. there must be an electric flow through poles, but it is impossible when using only distilled water

hey guys. i have 12V SLA battery and it wasn’t use 1 years. after charging its not save power as it should. the voltage was 3.6V and it dies after 10Sec. i collect some rain water and clean it with cotton filter. refill the 6 cells and charge the battery for 5H. in first hour it takes 0.3 ~ 0.9A and in next hours 2.6Amps. is it normal? what was my mistake? the voltage is 7.78 now and its not die fast. it can provide 7.78V for a LED lamp almost 3hours. what should i do to make it 12V or near 12?

please guide me how you had done ..please tell me how to repaire dead battery


Hi…I tried this method with 12v sealed battery and charged it for 12hr with connection source +’ve to battery +’ve and source -ve to battery -ve but it’s not charging more than 1V…ways a problem…

Can we revive battery with no continuity?


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You’re English is just fine, thanks mate. I might try this out when I have a bad battery but lately the last couple of years I haven’t had any problems and I use second hand batteries and second hand batteries are so cheap now that it isn’t worth trying unless you’re pretty broke desperate and already have the tools you need. Playing with acids is also pretty dangerous for your health and can cause severe respiratory problems and nasty deep burns so try to do this outside where there is open air. Have a garden hose next to you on standby or a full bucket of water just incase you get it on your face or eyes so you can flush it away. Try not to inhale acid fumes because you could end up paying for it later. But like I said if you have no other option and you have the tools then go for it. P.S. paper respiratory masks will not help because they build up harmful toxins because they are really only for dust and mild organic fumes if that. Use a real carbon filter mask and fully closed eye goggles when handling acids and wear full cover clothing and apron ($5 cheap disposable apron) and fully closed shoes in case of spills and skin contact. If you have any battery acid contact your protective clothing just simply remove your clothing and place in trash ‘do not bring it inside’ or leave it near kids or pets and shower immediately and do not rub your face and eyes until you have thoroughly wash your hands. This ideas of fixing batteries is really great but also remember safety. Sometimes it’s not worth the trouble over a second hand reconditioned battery replacement for $50 and sometime less if it’s just a good second hand battery. Personally I rather not inhale battery acid fumes or get it on my skin or eyes but when your desperate maybe look up some safe operating procedures before you become ill or injured! Nothings simple but safety is paramount but unfortunately third world countries tend not to waste any time or money on safety because it doesn’t make them money. In a modernized country you have no excuse so do the right thing by you and others. I hope this has been helpful and remember to implement a plan and safety procedure before attempting to handle hazardous substances or using dangerous tools and machinery. You’ll be glad you did

Persiverance+your guide+new charger = restored battery

The Honda battery is now holding an almost full charge, roughly 90-95% but good enough for me. Had to replace the original charger as it failed to power up. After further investigation it turns out the new charger can only charge batteries between 20Ah to 50Ah max so anything below this and the charger thinks the battery has failed and cuts the charge.

Battery charged up, connected up 2 20W hallogen bulbs and both are still bright 20mins later a big thank you, Eslam Eldeknawy

does this method work on 12v 200AH sealed Batteries?

I must say, this is without a doubt the best method to reconditioning batteries available. I have tried some methods in the past but none of them worked.

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