HP-75C Battery Question

[Maximilian Hohmann]

Hello!

This morning I got my first Christmas present for this year, when the postman delivered a box containing an HP-75C :-)


From the auction description I knew already that it has no battery (but is complete otherwise with charger, manuals, magnetic cards, video interface and cables - and working of course). It looks as if a classic series battery pack (3 AA cells) could fit inside, but the contacts are definitely different, as there are three of them instead of two... Unfortunately, the dead battery pack was not included, so I have no staring point for making a replacement


And so my question is: What are the specifications of the HP-75C battery pack? And is there maybe a source for refuirbished batteries anywhere (I had no luck with google and ebay searches so far)?


Greetings, Max

[Tony Duell]

The original battery is the same as the one used in classic calculators -- 3 AA NiCds in series. It makes contact to 2 of the spring terminals only.

I forget what the third contact is for (and the service manual is not very clear on this).

[Maximilian Hohmann]

Hello!

Quote:

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The original battery is the same as the one used in classic calculators -- 3 AA NiCds in series. It makes contact to 2 of the spring terminals only.

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That is definitely the good news of the day (for me). Thank you for the quick reply, I will try one of my classic battery packs when I am home tonight!

Greetings, Max