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Ni-Cad Capacity check

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raymondj(at)frontiernet.n
Guest

Posted: Tue May 22, 2007 5:36 pm Post subject: Ni-Cad Capacity check

Does anyone have a schematic for a capacity checker for small batteries like

Ni-Cads, etc.



Thanks,

Raymond Julian

Kettle River, MN.

do not archive

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nuckollsr(at)cox.net
Guest

Posted: Wed May 23, 2007 5:07 am Post subject: Ni-Cad Capacity check

At 08:33 PM 5/22/2007 -0500, you wrote:



 	  Quote: 	
		  



Does anyone have a schematic for a capacity checker for small batteries like

Ni-Cads, etc.


	


   I have a product under development that will do the task

   you're asking about. It's a 2.5 x 4 inch etched circuit

   board offered in three versions. They hold 4AA,

   2AA-2AAA or 4AAA cells and runs them down under a

   fixed loading condition. When discharge is completed,

   the time that each cell supported its load is reported

   by means of voltage readings taken with your shop

   mulitimeter. This device will be offered on my website

   for about $40.



   In the mean time, you might consider this product:



http://westmountainradio.com/CBA_ham.htm



   I have one of these and find it quite useful in a

   variety of battery studies. It's also been used to

   measure and plot data (voltage vs. time) for the

   evaluation of a number of battery chargers. See

   this example:



http://www.aeroelectric.com/Pictures/Curves/schumacher_3.jpg



   In terms of it's utility and versatility, the

   West Mountain Radio product is well worth the money.

   It's flexibility allows testing of any cells or array

   of cells over discharge current ranges of many amps down

   to tens of milliamps.



   Finally, the task is simple but the implementation

   for a roll-yer-own cap-meter is $time$ consuming.

   The goal is to craft a device that applies a load

   and records the time that a cell supports that load.

   My personal preference for mulit-cell evaluation uses

   a data acquisition module from Weeder Technology

   analog data input module



http://www.weedtech.com/wtadc-m.pdf



   teamed with a computer running a Basic program that

   measures and records data with respect to time for

   later analysis. This is the technique used for

   crafting the article at:



http://www.aeroelectric.com/articles/AA_Bat_Test.pdf



   . . . except that the data acquisition module

   used in this test was different than the device

   suggested above.



   The minimum $time$ route is the West Mountain Radio

   product with the AEC cap meter coming in second place.

   But if you'd like to acquire some REAL number gathering

   capabilities for both battery testing and a host of

   other applications, the Weeder Tech/Junk Computer approach

   offers a ton of capability for a very low investment.

        Bob . . .



        ----------------------------------------

        ( "Physics is like sex: sure, it may   )

        ( give some practical results, but     )

        ( that's not why we do it."            )

        (                                      )

        (                 Richard P. Feynman   )

        ----------------------------------------

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rv8iator

Joined: 11 Apr 2006
Posts: 144
Location: Newberg, OR

Posted: Wed May 23, 2007 5:25 am Post subject: Ni-Cad Capacity check

 	  Quote: 	
		  

>

>

>Does anyone have a schematic for a capacity checker for small batteries like

>Ni-Cads, etc.



Here is a link to a NiCad/NiMh capacity tester.  Not as capable as the West Mountain product but less money and self contained.  I have used the tester and it performs as advertised.


	


http://www.siriuselectronics.com/index.php?main_page=product_info&cPath=1&products_id=123



Chris Stone

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C. Stone (RV8iator)

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