|Battery pack for an HP-35|
Message #1 Posted by Jean-Michel on 9 Mar 2010, 4:12 p.m.
believe me or not, but I was given these past days two old HPs for free.
One is an HP-25, serial number 1803B... in very good cosmetic condition, as well as the leather-like pouch, with very few and minor scratches. It seems to have been used very few, as the keys still have the famous "rotate-and-click" behavior. Unfortunately, it has been left for years with the battery pack inside, and I found a huge leakage when openning it.
A good cleaning and fresh AA batteries did not bring it back to life. At least I now have a very nice paper weight...
The other I received just today is an HP-35, serial number 1302S..., in very good cosmetic condition too. Like the first one, it seems to have been unused the major part of its life, which is rather surprinsing when one knows the price of this calculator in '73!
Since there is no battery pack in it and the battery terminals don't show major evidences of battery leakage, I keep a tiny hope it's still functional.
My question is the following: since there's no marking in the battery compartment nor on the battery cover showing the polarities of the battery terminals, could someone tell me what they are, so that I could test the calc? Same for the 3 plugs on the back side, near the battery door.
In case of use, mine is like the third one starting from the left on this photo.
Any help much appreciated.
Edited: 9 Mar 2010, 4:33 p.m.