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Tool Talk Discussion Forum

Cordless batterries?? whats the deal here?

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Jay87T

12-12-2005 04:42:19




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Not trying to spam or nothing, just curious on what the deal is here with this ebayer, I have a couple dead weak 14.4 Dewalt batteries, how can I "revive" them.


http://cgi.ebay.com/COLEMAN-BOSCH-12-13-2-14-4-15-6-18-19-2-24-VOLT-BATTERY_W0QQitemZ7570439760QQcategoryZ50896QQssPageNameZWDVWQQrdZ1QQcmdZViewItem




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Bud in NC

12-13-2005 05:41:47




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 Re: Cordless batterries?? whats the deal here? in reply to Jay87T, 12-12-2005 04:42:19  
How come nobody offers after market (ie, cheaper) 14.4v Milwaukee batteries?



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cj3b_jeep

12-13-2005 05:33:46




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 Re: Cordless batterries?? whats the deal here? in reply to Jay87T, 12-12-2005 04:42:19  
Two Suggestions: The House of Batteries in Laguna, California rebuilds batteries very well. I've sent them obsolete stuff 25 years old and they rebuilt them cheap and well. They specialize in medical equipment.
Second idea is to buy something cheap that comes with a battery. I have a Ryobi 18 volt drill. A new battery is like $60. A new mini vac with a battery was on sale for $39.



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ErnieDD

12-12-2005 16:45:58




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 Re: Cordless batterries?? whats the deal here? in reply to Jay87T, 12-12-2005 04:42:19  
Here is how to rebuild them yourself.
1 Charge battery, run in drill or whatever for 2-3 minutes no load, just free spin.
2 Measure battery voltage with DVM, about 1.4 volt per cell, it will tell you how many cells are shorted out.
3 Disassemble battery, use dvm to locate dead cells. they are either good or dead, no in between.
4 Cannabalize one as a donor for cells to repair others. the metal strips solder easily.
5 Dewalt Batteries made in some countries are better than others.

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Bob

12-12-2005 07:11:52




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 Re: Cordless batterries?? whats the deal here? in reply to Jay87T, 12-12-2005 04:42:19  
Quite a number of years ago, one of the "mainstream" hobbiest magazines, perhaps Pop Mechanics, had an about "zapping" shorted ni-cads with a large capacitor to clear internal shorts, and restore their functionality. (Read cautions before trying that!)

This only works if "whiskering" is the problem, not if the ni-cad has dried out due to overcharging or overheating and venting gases.

Check out the link below. It's a long read, but continue down to "whiskering". In that paragraph, he describes what happens to many ni-cads, and how it can be cured.

As with about everything nowadays, try Googling "restore nicads" for a thousand or so other FREE "takes" on the subject.

Also, there is an "old wives tale" that apparently SOMETIMES works, and costs next to nothing to try... toss the battery pack in the freezer. Apparently, sometimes the thermal shock will clear the short inside the cell.

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RandyBee

12-12-2005 06:19:47




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 Re: Cordless batterries?? whats the deal here? in reply to Jay87T, 12-12-2005 04:42:19  
Just my guess from reading his feedback is that he is just zapping the batteries with a higher voltage and current source to temporarily re-vibe the batteries. I have done this before and it normally works but is not long lasting. Also not a good safe method as I have seen ni-cads explode under those conditions. He may be opening his self up for a law suit.



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Mattlt

12-12-2005 05:22:28




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 Re: Cordless batterries?? whats the deal here? in reply to Jay87T, 12-12-2005 04:42:19  
Check out the guy's feedback. (Click on the number in parenthesis next to his username) You'll see that some people have been less than impressed with the method.



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Jack B. Nimble

12-12-2005 05:16:56




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 Re: Cordless batterries?? whats the deal here? in reply to Jay87T, 12-12-2005 04:42:19  
You can"t "revive" a dead battery. They can however be rebuilt. The company I work for sends about 50 14.4 volt Dewalt batteries per year to our Interstate battery dealer for reuild. They take them apart discard the old cells and replace with new ones. You end up with a new battery in the old case for about half the cost of buying complete new batteries. Thats a big savings when you have a couple hundred tools in use out in the field.

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Fred OH

12-13-2005 12:32:15




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 Re: Cordless batterries?? whats the deal here? in reply to Jack B. Nimble, 12-12-2005 05:16:56  
I built a zapper and have saved quite a few ni-cads that were whiskered. I think I got a diagram out of a radio magazine to build it. If you are trying to zap a series of batteries connected together...you have to take it apart and zap each cell that needs it. I think if you zap it till it has two tenths of a volt on a digital voltmeter across the terminals, it will then take a charge. I don"t remember the size capacitor that is used in it but too large might make it explode. Sometimes bigger isn"t better. You have to keep the polarity correct too. Fred OH

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