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Tool Tips Here you will finds tips on using old tools, as well as the latest in new tools that you can use on your 'Bird's projects.

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  #11  
Old 12-07-2009
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Quote:
Originally Posted by curtsprenger View Post
Nothing to do with 'Birds. on this post unless you carry NiCad powered tools. Short post to start...

Today I tried a procedure to bring a 14.4 volt NiCad tool battery back to life. The battery was dead, would not take a charge, measured zero voltage on the meter, and I was going to throw it out. After the first two steps the battery measured 13 + volts. Placing the battery in the battery charger until the light showed 'Charged', the battery now measures 16.6 volts. Placing the rejuvenated battery in the hammer drill, I don't believe the drill has every run that strong. Longevity remains to be tested.

Anyone done anything like this before? I can post more if there is interest.
Curt,

I deleted your detailed how to do this post, but if you will please post the link to the eBay web site where you purchased the information.
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  #12  
Old 12-07-2009
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Default ebay Link to NiCad DIY Fix Video

ebay link to the NiCad Battery Fix Video.

http://cgi.ebay.com/ws/eBayISAPI.dll...:X:RTQ:US:1123
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  #13  
Old 04-18-2010
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One may want to seriously consider eye, ear, and hand protection when messing with these potential firecrackers.
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  #14  
Old 06-05-2010
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Quote:
Originally Posted by curtsprenger View Post
Ebay link to the NiCad Battery Fix Video.

http://cgi.ebay.com/ws/eBayISAPI.dll...:X:RTQ:US:1123
I tried that link and it is no longer on eBay, so I looked on YouTube to see if there was one on there and I actually found two, so I checked with Curt to see if they were similar to what he got from the eBay auction and he confirmed although it was a different video the method was the same, so here is what I found for FREE with no infringement on anybody trying to sell anything right on YouTube, check out;

http://www.youtube.com/watch?v=H60xt...eature=related

Here's another video with the same method.
http://www.youtube.com/watch?v=PzIlVLOH9XI

Remember, just like Rich Johnson suggests;

Quote:
One may want to seriously consider eye, ear, and hand protection when messing with these potential firecrackers.
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VISIT THE FINN'S INN EXPRESS REMODELING ADVENTURE AND TECH. TIPS
I'M SO SLOW ON THE HILLS,THAT I GET TO SMELL THE FLOWERS AS I GO BY.....AND WATCH THEM GROW TOO!! NOT SO MUCH ANYMORE
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  #15  
Old 06-05-2010
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The operational theory here is that these are batteries (a collection of cells in series). The thing that kills them is the 'difference' between the most charged and least charged cell.

The battery will only charge up to the extent of the most charged cell, or thereabouts, and can only discharge to the extent of the most discharged cell. Thus, if you have one cell at half charge, and one discharged, your battery will have a greatly diminished capacity.

"Forcing discharge" by running reverse current attempts to 'level' the battery, which is what rejuvenates it when this works.

Be very gentle when doing this, and monitor the heat of the battery. Never, ever do this with a NiMH battery, as they generate potentially explosive levels of hydrogen when heated.
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  #16  
Old 06-05-2010
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I think that guy in the video using the welder and bolts is an idiot..

We used to rejuvinate batteries back in school using a capacitor reversed polarity accross the battery. I think this video is much safer and more reliable;

http://www.youtube.com/watch?v=Ja2TX...eature=related
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  #17  
Old 06-05-2010
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Quote:
Originally Posted by rtpn60 View Post
I think that guy in the video using the welder and bolts is an idiot..

We used to rejuvinate batteries back in school using a capacitor reversed polarity accross the battery. I think this video is much safer and more reliable;

http://www.youtube.com/watch?v=Ja2TX...eature=related
I don't know if he was an idiot, but he wasn't taking precautions and doesn't appear to know the risks.

At the very minimum I would not do this without insulated gloves, a blast shield (even a sheet of polycarbonate held with clamps would be better than nothing) and eye protection.

I remember when I was a kid once working with my dad we were discharging a deep cycle battery using a load resistor and it exploded, spraying boiling acid and handgrenade velocity plastic shards all over the back wall.

My dad turned to me after that happened and apologized, saying he had never had that happen before so he wasn't taking the right precautions.

What he didn't have to say is that we narrowly escaped getting serious chemical burns with debris injuries.

I guess this guy hasn't seen what happens when the batteries actually -fail-. Let's hope for his sake that when he does he is as fortunate as I was.
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