I quit using most of my other calculators and, today, use an HP 25C almost
exclusively, though I have a '21 also.  I didn't know those were collectibles.
back in the '70's, I modified the battery holder so I could replace the
batteries when they went bad.  This was a common problem.  The use of 1.5-volt
batteries probably won't hurt anything if my own calculators are any indication,
though I've usually replaced the NiCd types with others of the same sort.
Dick
----- Original Message -----
From: "Robert Stokes" <Robert.Stokes(a)vu.edu.au>
To: <classiccmp(a)classiccmp.org>
Sent: Thursday, September 27, 2001 12:52 AM
Subject: Re: Calc wars
  I've still got a working HP25 that I keep going by
fitting new AA NiCds
 into the HP battery drawer.  Can't leave it on the charger too long or
 the batteries die.
 The programmable part no longer works, but.
 Cheers,
 Robert.
 --
 _________________________________________________
 Robert Stokes
 Scientific Officer
 School of Human Movement, Recreation & Performance
 Victoria University of Technology
 Ph  61 3 9688 4381
 Fax 61 3 9688 4891
 Robert.stokes(a)vu.edu.au