Can you post a link to the website with details? I've just made a few external battery connectors for 286 and 486 motherboards so if they suit then I can tell you which parts you'd need.

The ones I made have connectors that look the same as the PC speaker connector and take 4x AA batteries to provide 6VDC.

The link to the motherboard is here: http://www.uktsupport.co.uk/pb/mb/450.htm.

The battery I'm thinking on looking for would have a connector like in this picture: https://www.adafruit.com/products/783.

That connector definitely won't fit, plus the battery would supply 6V and the board only wants 3V. You'd need to find a battery holder with only one CR2032 in it, not two.

The connector in your link also has only two pins side by side, but the manual says you need the wires to sit on pin 1 and pin 4, with two empty pins in the middle. You'll need a 4-pin Dupont connector with only two wires in it, like this PC Speaker cable. The motherboard info you posted says pin 1 is +3V, so the red wire goes to pin 1 on your motherboard, and that will make the black wire go to pin 4, with pins 2 and 3 empty.

You can either find a CR2032 battery holder to use, or it might be easier to use a 2x AA battery holder which will give you the same 3V.

Awesome! Thanks for your help!

Batarjal wrote:

I could use an external battery pack. Unfortunately tracking down this part has proven impossible.

TADIRAN TL-5242/W
They still produce it so it can be easily found on ebay or electronic stores like mouser, digikey.