Are you tired of having your Ni-Cad batteries that refused to charge and simply die?

So what do you do with them when they die?
Just throw them in the trash - which harms the environment?
Or just take them to a recycling facility for them to be recycled?

Well, here is the best solution, bring your dead batteries back to life that can save you a chunk of change - By zapping them!
Here is one great instructable, Revive Nicad Batteries by Zapping with a Welder. Of course, you will need a welder, and not many people has one... So I came up with this idea that almost anyone can build!

UPDATED: This instructable has been featured in hackaday!

This instructable involves hacking a device that operates on 300 volts and can be dangerous if not handled correctly. So, I am NOT responsible whatever happens to you using this information.

Step 1: So, Why do Ni-Cad batteries die?

Why do Ni-Cad batteries die?

They don't exactly 'die', it is the sulfur crystals that is causing the problem.
The crystals are formed and begin growing caused by:
  • Overcharging the cell
  • Leaving the cell in the discharge state for a long time
  • Memory effect
  • Being exposed in high temperature

After the crystals has begin growing inside the cell, it eventually touch both ends of the cell terminals. This shorts out the cell and preventing it to be recharged again...

But, the good thing is the sulfur crystals can be easily destroyed, by putting a hefty surge current through the cell... This vaporize the crystals and the battery should be good as new again!
<p>Inspite of reading several hours time about NI cd charge r evival no step by step de tails are seen &amp;got bored to hear the repeated advertisement alone.plz show step by step u r procedure for Recharging dead Ni cd &amp;many other cells batteries etc as u assured soon</p>
<p>There&rsquo;s a new way called <strong><a href="http://www.ezbattery.info/" rel="nofollow">EZbattery (www.EZbattery.info)</a> </strong>to bring nearly any type of old battery back to life so it&rsquo;s just like new again. This method works with nearly every type of battery out there ...and it&rsquo;s simple and quick. In case you&rsquo;re wondering, you&rsquo;ll be able to bring car, phone, and laptop batteries back to life with this. It even works with solar/off-grid, marine, golf cart, and forklift batteries. Plus, many more!</p>
<p>Can anyone confirm whether you can recharge NI MH rechargeables on a Ni Cad recharger</p><p>Kev</p>
<p>My NiCd charger says it will also recharge NiMH batteries.</p>
<p>Yes, this is the safest method. If the charger's manufacturer says so you can charge both with any type of charger. Typically though each one is for its own kind of batteries. However, I have rebuild a few old NiCd power packs using NiMh batteries, charged them with a smart NiCd charger made by B&amp;D and so far did NOT have any adverse effects whatsoever. Performance wise the NiMh outperform NiCd in the capacity category and last considerably longer. NiCd on the other hand seem to be able to provide a bit more initial torque than NiMh but I have not been able to reliably substantiate this claim. All in all, I believe from personal experience that NiMh are a much better replacement for NiCd overall.</p>
<p>True sir, most smart chargers can charge either type. Also, I have observed from my own experience that NiMh batteries start with a higher fully charged output voltage (I know that NiCd batteries only charge up to 1.25 volts per cell) and last <strong>far</strong> longer than their NiCd equivalents.</p>
<p>NO you can NOT</p><p>Totally different system</p>
<p>They are a different system but they are not &quot;totally&quot; different. If one has a &quot;smart&quot; charger, especially if it was manufactured after 2005, charging either type of batteries with a NiCd charger should be no problem. In general however, I wouldn't recommend charging NiCd batteries with a NiMh charger.</p>
could this &nbsp;be used to give laptop batts a second life?<br /> those suckers are pricey.
i woudnt risk it!<br /> li-ion or li-po batteries are very dangerous! but you can rebuild them!<br /> just open it up then order the same type of &quot;cells&quot; that look like batteies, then just replace!<br /> it is somewhere on the net....<br />
Thank you for answering this question!
what if the laptop battries are AA sized and you know they are Ni-Cad
late reply, but you could try freezing the batteries for 12-14 hours then cool down recharge then discharge several times. it worked for me with one battery, but not with the second, look around the internet for more information<br />
There are no sulfur crystals in a nickel cadmium battery. These are needles of cadmium that grow from the negative electrode, puncture the separator, and touch the positive electrode, thus creating a short. What this procedure does is to force a high current through the dendrite (needle of cadmium) and melt it so as to remove the short. Further, just for academic information, there are two kinds of shorts: a soft short and a regular short. A soft short is one where the dendrite does not make very good contact with the positive electrode. It is similar to connecting a high-value resistor accross the cell. A cell with a soft short will be able to get charged, but will get self-discharged when it is kept idle. A regular short is where the dendrite makes a good contact with the positive electrode. A cell with a regular short will not be able to get charged since it will shunt the charging current through the short and will deprive the electrodes of this current for getting charged. You can also check the effectiveness of this procedure by observing the self-discharge of the battery. If the battery is able to hold most of the charge for a reasonable period (a few days or a week) then the procedure is effective and you would have incurred substantial savings! This procedure is not applicable for cells that have failed due to dry-out. Dry-out happens when the cells have been continuously over-charged and have lost the moisture from the electrolyte, making it non-conductive. This can happen due to many reasons such as a bad seal in the cell, bad cells in the battery leading to over-charge, extended over-charge due to long time charging on a manual charger or due to a defective automatic charger. <br>Sorry for the very long comment. As a battery technologist, I thought that I could provide more insight into how and why this procedure works, its effectiveness and its limitations.
Hi Zubain, Do you think we can do this instructable with laptop batteries? Also (probably more difficult) Do you think we could do this with internal batteries, like iPhone batteries?
Wow!! Thank you so much!! By the way, I have two questions for everyone. 1. Can this be altered for a laptop battery? And 2. I saw an instructable on harnessing energy from the ground and air, using a capacitor. Do you think that it can be used to bring batteries back to life? Thanks in advance!
Can we use this trick on 12 V car battery??? regards.
<p>I realize I'm 4 years to late to be giving you an answer, but here is something incase you need to ask it again: http://www.instructables.com/id/Desulfator-for-12V-Car-Batteries-in-an-Altoids-Ti/</p>
<p>Also a little late but, I'm not sure because car batteries are lead acid</p>
probably a little late but in case you or anyone else is interested in removing sulfur from a car battery you have to realize that it's the quick pulses that desulfate the plates on a car battery, and doing so repeatedly often while charging, so a few longer and weaker pulses from a capacitor won't make much of a difference to the sulfur on a car battery. There are a few instructables on car battery savers as well though and a quick Google search will give back a ton of results.
<p>i had a 160uf 330v capacitor from my old camera. i had dead Nimh battery and i made a direct circuit with capacitor and good alkaline cell with dead cell and i think i burnt my capacitor..... it smells bad. Please help me...</p>
<p>Rather than make one are they available for purchase anywhere ....I just don't have the time to make one right now and lots batteries to revive...L.O.L.....thanks</p>
Hi Plasmana. Loved the instructable. Thank you so much.I have bought too many cordless tools because they are cheaper than new power packs. Having hacked the packs apart, they all have the same cells - now also separated. How can I test individual cells (1.2V) a) to ensure they will be rechargeable (or are they always rechargeable); b) how do I discharge them - I'm thinking a circuit with a low volt bulb until it goes out, then check with a multimeter or battery tester. I don't want to do all this zapping and then discover one cell is entirely dead and have to remove it and start over. I'm 64 and every second counts!<br>I have an assortment of wall chargers (one for each too!!). How do I test that these are working? Some have LEDs, some of which light and others not so much. They have varying DC voltage at the input plug and the same at the tabs inside the base. Why do some have two large tab and others have an extra two tiny ones?<br>Lastly, can I charge NiMh packs on a NiCd charger of the same voltage?<br>Your latest favourite and follower, jenni.<br>
<p>I like the idea of a capacitor to bring back life to NiCad batteries. How well does this work in cordless power tools. I have a Craftsman 19.5v drill and power saw. Using this method, would zapping the battery pack have any worthwhile effect as opposed to, say, a battery charger or welder? I like the capacitor method because of the high voltage hit. It seems it would do more that just getting a battery to accept a charge.</p>
<p>Tried you method yesterday on 8 years old B@D drill battery, NiCad 1.2Ah. Found 6 dead cells. Zapped them individually and the battery altogether. Today the battery works fine, holds charge. Don;t know for how long, but it DOES. B4 it was not even taking any charge. So, thanks a lot. And, guys, be careful, I zapped myself by mistake. Kinda hurts...:-(</p>
Would it be possible to do this one at a time to the individual cells of a battery connected in series? As in what you would find in a drill battery pack. Mine has 24 cells in it and I don't want to detach the metal tabs on each of the batteries.
Really like the idea of using a capacitor plus all the circuitry from disposable camera, much safer than 'taping' wires onto battery <br>Could also place battery into 'explosion proof' cylinder or somesuch metal box with plenty of expansion room?
Is polarity an issue? <br> <br>If so, how do you find polarity on the capacitor, and how do you allign the polarity of the capacitor with the polarity of the battery to be zapped? <br> <br>Thanks, PP
I use jumper cables and a car battery. Works everytime.
Hello, thats fine. My problems are 3 NiCd 18V accus. From a screwdriver. How shall I refurbish these. Otherwise they are poison rubbish.
hey could this be used on bigger batteries eg. NiCd rc batteries 7.2 volts.
Back in 1992 when i first recived my ham radio ticket My instructor told my class that you can strike a rechargeable battery with a car battery charger 15 times and it would bring most of them back to life. I have sucsesfully done this many times. All have come back to life. I hope this helps.
I took your advice and used a car battery charger - it worked a treat!
You mean short out the battery 15 times with a car battery?
Yes. Put the pos from the car bat to the rechargeable battery pos, (using jumper cables) then strike the neg 15 times. Do not hold it to the battery just strike it. If you hold it to long it can explode.
Ahh okay, I have been told that is it very dangerous to even strike an ni-cad battery with an car battey, I guess they are wrong :P
I think he meant car battery charger, not the battery itself. This works I used it to bring back an old dead cordless drill.
What happens over time is the polarity in the batterys revers and this will realign them. After you strick them put them in a charger for the length of time it would take to charge them. Glad that i could help.
Thanks for your advice, I will try that when i get more dead batteries :-)
do you know if that would work with electric scooter batteries?<br />
As far as i know it will only work on any 1.5 or 1.2 volt batteries. It may work up to 6v small ones but not sure.
ok, thanks<br />
I have known about this since the 70's when I used to fly radio control plains. It does work. Your process is much nicer and I will try it. Thanks for the great idea Phil Galati
I didn't know you could fly an entire plain remotely.
lol, I thought the same thing!
Thanks for your nice comment! :-)
Still looking for an answer to whether or no this works with NiMh batteries...promt response appreciated !!!

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