Unknown battery pack


I've just aquired a Melcor SC-635 calculator that's missing its battery pack. Does anyone know what voltage the original pack would have been? The keyboard has a nice colour scheme now that I've removed a few decades of cigarette smoke residue.


Hi Nick.

Have you seen this page:

Tony's Taschenrechner-Sammlung Calculator-Collection

Here's the link to the Melcor SC-635 from his site

Melcor SC-635

I hope this helps

Edited: 26 May 2012, 9:21 p.m.


Thanks for the link. I found it earlier but saw that he only refers to an external 9 volt charger and didn't open up the calculator to see what kind of battery pack it had.
I suspect the pack voltage was much lower than 9 volts. I've run the calculator on 3 volts and it works after a fashion but keeps insisting that x/y = x^2. Perhaps the corrosion I discovered within has rotted its electronic brain.


I thought the link was worth a try. Hope you find a fully functioning one.

Edited: 27 May 2012, 12:26 a.m.


Actually I don't mind that it gives wrong results. I just like the fact that it was made in the USA back when there was a thriving calculator industry.
Besides, what do a few incorrect answers really matter if you're designing nuclear power plants or highway bridges...

Possibly Related Threads…
Thread Author Replies Views Last Post
  [OT] Unknown Olivetti calculator? Cristian Arezzini 4 1,873 05-24-2013, 01:17 PM
Last Post: Thomas Klemm
  HP 41 Battery Pack Rebuild John Ratard 0 2,109 09-29-2012, 01:37 PM
Last Post: John Ratard
  Disassemble Battery Pack 82028B (woodstock) Jacques Karensky 0 1,130 05-19-2012, 03:39 AM
Last Post: Jacques Karensky
  aOT--Battery/battery contact care advice needed Matt Agajanian 0 1,142 04-24-2012, 07:35 PM
Last Post: Matt Agajanian
  HP-30b unknown options Christopher Johnson 3 1,375 02-01-2012, 08:37 PM
Last Post: Christopher Johnson
  HP41 battery pack Cristian Arezzini 1 1,323 11-07-2011, 06:36 AM
Last Post: Ignazio Cara (Italy)
  HP-19c battery pack replacement (again...) Xavier A. (Brazil) 8 2,738 09-22-2011, 04:41 PM
Last Post: Xavier A. (Brazil)
  [BUG] HP 50g SOLVE/SOLVR menu does not display unknown var François Vanzeveren 3 1,384 09-20-2011, 06:56 AM
Last Post: C.Ret
  HP-41 Unknown Interface Juergen Keller 7 2,032 08-28-2011, 02:24 AM
Last Post: Ángel Martin
  HP calculator model unknown Guzzi850 7 2,161 07-30-2011, 11:26 PM
Last Post: Guzzi850

Forum Jump: