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  1. Xref: sparky rec.models.rc:3059 sci.electronics:13564
  2. Newsgroups: rec.models.rc,sci.electronics
  3. Path: sparky!uunet!ftpbox!mothost!lmpsbbs!bobwo
  4. From: bobwo@ecs.comm.mot.com (Bob Woodhouse)
  5. Subject: Re: How to dispose of NiCads?
  6. Organization: secure_comm
  7. Date: Wed, 29 Jul 1992 14:40:13 GMT
  8. Message-ID: <1992Jul29.144013.24001@lmpsbbs.comm.mot.com>
  9. References: <1992Jul28.140405.28429@gdunix.gd.chalmers.se> <p5mmrwq.brunette@netcom.com> <1992Jul29.084514@ufps9.unifr.ch>
  10. Sender: news@lmpsbbs.comm.mot.com (Net News)
  11. Nntp-Posting-Host: 145.1.147.44
  12. Lines: 36
  13.  
  14.  
  15. >|>             300 ohm              Charge
  16. >|>                5W             /  Switch 
  17. >|> 20-40 + O---/\/\/\----o------o  o------------o-------------------------o
  18. >|> VDC                   |                      |                         |
  19. >|>                       |      Zap             |                         |
  20. >|>                       |      Switch          |                        +|
  21. >|>                       |      ___|___         |                    -----------
  22. >|>                       o------o     o---------o                       -----
  23. >|>                       |                      | +             Shorted   |
  24. >|>       6000 micro-     | +                 -------             Cell     |
  25. >|>       Farad, 40V  _________               |     |                      |
  26. >|>       Capacitor   ---------               |_____| Volt                 |
  27. >|>                       |                      |    meter                |
  28. >|>                       |                      |                         |
  29. >|>       - O-------------o----------------------o-------------------------o
  30. >|> 
  31. >
  32. >Please correct me if i get this wrong, i guess the above circuit requires
  33. >to remove the dead cell from the multi-cell pack, right ?
  34. >  
  35.  
  36. Why would you have to remove the cell -- just hook up to the cell of interest and go.
  37.  
  38. >Which means, one has to take the Ni-Cd pack appart, and get the dead cell out.
  39. >The cells are usually connected with a point welded metal plate, which requires
  40. >you to rip the metal plate off the cell. 
  41. >Now, once you fixed your shorted cell ( you hope ),with the above circuit ,you will have to
  42. >solder the cell back in place, which isn't that abvious, if you apply to much
  43. >heat when soldering you may damage the cell, if you don't apply enough heat you get
  44. >a cold solder spot, in which case it may brake loose, due to vibrations.
  45. >
  46. >-- 
  47. >ben
  48. Bob Woodhouse
  49.  
  50.