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Reviving dead NiCd Batteries

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Forum topic by PurpLev posted 08-17-2008 02:21 AM 17439 views 0 times favorited 22 replies Add to Favorites Watch
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PurpLev

8476 posts in 2307 days


08-17-2008 02:21 AM

Topic tags/keywords: tip resource nicd battery cordless revive fix

Just came upon this site, and thought others here might find it useful, I have yet to try this technique, but have several dead batteries that might benefit from such treatment (if it works) so I may try it out soon enough

http://www.instructables.com/id/Revive-Nicad-Batteries-by-Zapping-with-a-Welder/

-- ㊍ When in doubt - There is no doubt - Go the safer route.


22 replies so far

View lew's profile

lew

10036 posts in 2414 days


#1 posted 08-17-2008 03:03 AM

That’s a pretty cool idea. I would probably use a battery charger or capacitor- don’t have a Mig welder.

Lew

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

View tenontim's profile

tenontim

2131 posts in 2403 days


#2 posted 08-17-2008 03:22 AM

This looks like a good way to have your name added to the Darwin Award nominees. I have a couple of dead batteries. I think I’ll tell my brother in law about this procedure and let him try it. :]

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PurpLev

8476 posts in 2307 days


#3 posted 08-17-2008 03:52 AM

Lew – I don’t have a welder either, I think the idea is to use something with more current than the battery you are trying to revive, so I’ll probably juse connect some 9v batteries in series, or something similar to that idea to try and bring my 18V batteries back to life.

Tim – post back after you let your brother in law try it out, and let use know how it worked out for you.

-- ㊍ When in doubt - There is no doubt - Go the safer route.

View SteveKorz's profile

SteveKorz

2131 posts in 2372 days


#4 posted 08-17-2008 05:31 AM

...Interesting…

I’m certainly letting the brother in law do it…. that’s the safest option for me… lol.

-- As iron sharpens iron, so one man sharpens another. (Proverbs 27:17) †

View LoneRider's profile

LoneRider

26 posts in 2331 days


#5 posted 08-17-2008 06:28 AM

Personally, I would not risk it, what if the battery was actually shorted between the two terminals? anyway:

From RepairFAQ.com

“Yup—a quick fix it. When cells short due to dendrites, the piece of material that is actually shorting the cell is very thin. So, by forcing a huge impulse of current into the cell, one can vaporize the dendrite—sort of blowing a fuse.

This works, and can revive an otherwise shorted cell. However, it is a stopgap measure at best. First, the fact that one dendrite has formed means that another is not too far behind. Second, the material that was vaporized has now permeated the separator material, forming a resistor that shorts the plates. The cell may no longer be shorted, but will still have a poor charge retention.

Besides, unless done properly, this can be dangerous as large currents are necessary”

-- Tom - Canadian in N. Texas

View Dick, & Barb Cain's profile

Dick, & Barb Cain

8693 posts in 2958 days


#6 posted 08-18-2008 02:29 PM

I don’t think I would take a chance, because of a possible explosion.

A dead battery could make you dead.

-- -** You are never to old to set another goal or to dream a new dream ****************** Dick, & Barb Cain, Hibbing, MN. http://www.woodcarvingillustrated.com/gallery/member.php?uid=3627&protype=1

View PurpLev's profile

PurpLev

8476 posts in 2307 days


#7 posted 08-18-2008 03:15 PM

True – there is the possibility of electrocution, and electric driven explosion… so these things if attempted should be done carefully and with the utmost level of safety.

I just found this bit of information to be interesting. I do however plan to try this out as soon as I can setup a safe environment to run this in.

-- ㊍ When in doubt - There is no doubt - Go the safer route.

View Dick, & Barb Cain's profile

Dick, & Barb Cain

8693 posts in 2958 days


#8 posted 08-18-2008 03:50 PM

I had a weird thing happen to me once. I had 2, 9V batteries in my pocket, & the buttons on them made

contact, & almost burned me they got so hot.

-- -** You are never to old to set another goal or to dream a new dream ****************** Dick, & Barb Cain, Hibbing, MN. http://www.woodcarvingillustrated.com/gallery/member.php?uid=3627&protype=1

View PurpLev's profile

PurpLev

8476 posts in 2307 days


#9 posted 08-18-2008 04:04 PM

Dick -that reminds me, I (stupidly) had some ignite-on-anything-matches in my pockets years back, and someone rubbed against me…. and well… It was very hot… and I didn’t have a pocket no more… (note to self – do not carry ignite-on-anything-matches loose in your pocket)

just gotta be careful, like we should be with 100% of our woodworking equipment anyways. nothing new here. just more of the old stuff.

-- ㊍ When in doubt - There is no doubt - Go the safer route.

View coloradoclimber's profile

coloradoclimber

548 posts in 2726 days


#10 posted 08-18-2008 05:15 PM

PurpLev, I can beat that. When I was young we lived out in the country. As kids and teenagers we all had firearms and hunting and shooting was part of daily life. So one day my brothers and I were out shooting 22 rimfires. When shooting a 22 I usually dump a box of rounds in my back pocket for easy access, dont have to open and mess with a box every time I need to reload. Then at the end of the day I clean out my back pocket and put all the unused rounds back in the box, normally all good.

You know with a 22 rimfire the primer is around the rim, not in the center like in a larger cartridge. So one day after shooting I clean out my back pocket, jump back in the truck and head for home, along the way we stop at the local playground and I start chasing my little brothers around. Now back in the old days we had those TALL metal slides, with no safety sides or any of that. So I chase my brother up the slide and jump on and down I go (you can probably see where this is leading), sure enough, I had left a round in my back pocket. The metal rim of the cartridge got pressed by my butt down against the slide and with the friction of sliding with the rim rubbing against the slide, bang, the round went off. Fortunately nothing was really hurt but my pride, a little bit of a scorch and a rude surprise.

View PurpLev's profile

PurpLev

8476 posts in 2307 days


#11 posted 08-18-2008 05:30 PM

coloradoclimber – don’t even get me started… or I’ll have to go into details about how boiling sulfar chemistry experiment goes bad and explodes into melting substance…. still have the scars to remind me of that…lol (yeah, it’s a funny memory now, but back then I don’t recall thinking of it in a very amusing manner).

-- ㊍ When in doubt - There is no doubt - Go the safer route.

View ChicoWoodnut's profile

ChicoWoodnut

904 posts in 2474 days


#12 posted 08-19-2008 05:15 AM

This sounds like a perfect candidate for “Mythbusters”. Maybe they could make a whole segment on it and take it to extreme. We could send them all of our dead batteries for experiments.

-- Scott - Chico California http://chicowoodnut.home.comcast.net

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coloradoclimber

548 posts in 2726 days


#13 posted 08-19-2008 06:14 AM

Boiling sulfur chemistry with scars !!! YOU WIN :)

I did have a can of starter fluid blow up on me, knock me flat and send me to the emergency room, but no scars, I’m still as pretty as ever :)

View NY_Rocking_Chairs's profile

NY_Rocking_Chairs

500 posts in 2256 days


#14 posted 08-19-2008 12:27 PM

When I was a kid my father was welding on his dirt bike, he had the bike lying on a cloth ground cover, you guessed it, soon the ground cloth was on fire, with the gas tank still on the bike. Luckily I was able to get his attention and he got the fire extinguisher and put it out before any kind of bad thing happened.

From then on we removed the gas tank before welding and also remounted the fire extinguisher so I could reach it…

-- Rich, WNY, www.nyrockingchairs.com

View Steelmum's profile

Steelmum

355 posts in 2621 days


#15 posted 08-19-2008 01:31 PM

I posted this on the “Mythbusters” site. I want to see what they think. I’ll let you know.

-- Berta in NC

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