The Museum of HP Calculators

HP Forum Archive 10

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HP21 bacteries
Message #1 Posted by Fabio Bertella on 26 Feb 2003, 10:19 a.m.

I would like to know the characteristics of rechargeable bactery (voltage and intensity) of HP-21, because I have it damaged. In HP museuum i cannot find this information Thank you, Fabio Bertella

      
Re: HP21 bacteries
Message #2 Posted by Philippe on 26 Feb 2003, 12:21 p.m.,
in response to message #1 by Fabio Bertella

Very easy: 2 cells CD-NI 1,2V 600mA. But works great with to AA Alkaline battery (2x1,5v) good luck !! Philippe from France

      
Re: HP21 bacteries
Message #3 Posted by Frank Glitz on 26 Feb 2003, 4:36 p.m.,
in response to message #1 by Fabio Bertella

Hi Fabio, look at http://www.hpmuseum.org/batts/battery.htm. Very useful information IMHO.

Regards, Frank

      
Re: HP21 bacteries
Message #4 Posted by David Smith on 27 Feb 2003, 5:59 p.m.,
in response to message #1 by Fabio Bertella

I use 1800 maH AA sized NiMH cells in my woodstock series machines... they give three times the run time of the standard 600 maH NiCad cells (you charge them for three times as long).

            
Re: HP21 bacteries
Message #5 Posted by Gray Wilson on 27 Feb 2003, 9:02 p.m.,
in response to message #4 by David Smith

David - do you use the standard HP charger?

                  
Re: HP21 bacteries
Message #6 Posted by David Smith on 27 Feb 2003, 9:55 p.m.,
in response to message #5 by Gray Wilson

Yes, I use the standard HP charger. As long as the charger is a slow charge system, NiMH cells will directly replace NiCad cells... it just takes propotionally longer to charge them fully.


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