RE: (ET) batteries- Internal Impedance

[JohnKelly oaktech com]

Sears' Auto department uses a fancy computerized impedance tester to decide
if your DieHard has died easy but the box is just a more elaborate version
of the load testers which have been discussed here from time to time.  As a
battery ages it looses the ability to supply high current at close to the
rated voltage.  This is caused by a rise in internal impedance.  Lower
impedance is better.

                         John Kelly


                                                                           
                             
                    "Hazen, Dwight L"                                      
                             
                    <hazen indiana edu>               To:     "'Neil 
Dennis'" <wombat RealNS com>,      
                    Sent by:                          Elec-trak <elec-trak 
cosmos phy tufts edu>        
                    owner-elec-trak cosmos phy        cc:                  
                             
                    .tufts.edu                        Subject:     RE: 
(ET) batteries                   
                                                                           
                             
                                                                           
                             
                    03/26/2001 11:11 AM                                    
                             
                                                                           
                             
                                                                           
                             






Yes, I have head the same thing from the Telco industry. Internal impedance
is the test they use.

  Dwight

Dwight L. Hazen, Indiana University, UITS
Bloomington, In. 47408-7378 Phone 812-855-5367 hazen indiana edu
http://php.ucs.indiana.edu/~hazen/ Ham Radio wb9tlh arrl net




> -----Original Message-----
> From:   Neil Dennis [SMTP:wombat RealNS com]
> Sent:   Monday, March 26, 2001 1:26 PM
> To:     Elec-trak
> Subject:     (ET) batteries
>
> Just reading an interesting article in an industrial mag. with a side
> bar about battery maintenance.  The major point was that a hygrometer
> was vasically useless to determine true battery condition ???  They
> stated the right way was to measure internal impedance - Motorola used
> to make a tester that did just that - Sears was the major customer.
>
> any comments ?
>
> wombat