Has anyone retrofitted their older calcs? Message #1 Posted by Matt Agajanian on 1 Mar 2012, 6:23 p.m.
Hello all,
As I admire keeping an older 35, 45, 65, Series E, HP-67, 21, etc. in its pristine condition, has anyone retrofitted their calc insofar as to re-engineering the battery to accept store-bought AAs or some other easily accessible battery size? yes, yes, I know it hampers up the vintage/pristine condition of the unit but, replacing the original batteries doesn't seem possible as no one makes spares for HP's 35+ year old masterpieces.
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