Question CMOS Battery clip broke, how do I fix it?

FreyjasChosen

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Jan 8, 2009
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Hello all!

I recently purchased a 486 PC from circa 1993 as a restoration project, and the first thing I tried to do was replace the CMOS battery (# 1025). However, when I tried to take the old battery out, the clip that holds it in place broke off. Does anyone know where I can order a replacement holder for a 1025 CMOS battery?
 

FreyjasChosen

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Thank you all for the quick responses. I uploaded a pic to imgur for your consideration, I hope it works:

View: https://imgur.com/KK5Z8FL


It appears this CMOS standard isn't used any more, when I type CR1025 into mouser (and Google) I get no results.

However, I did run across this one:
http://www.batteryholders.com/part.php?pn=BH401&original=CR1025&override=CR1025

I'll have to disassemble my PC further and see if that one will work. I'm new to messing with CMOS batteries, so I still have some questions. The clip that broke off is a positive terminal that has to be metal, right? And will the PC be able to operate without the battery, at least for testing to see if the hardware still works?
 
Thank you all for the quick responses. I uploaded a pic to imgur for your consideration, I hope it works:

View: https://imgur.com/KK5Z8FL


It appears this CMOS standard isn't used any more, when I type CR1025 into mouser (and Google) I get no results.

However, I did run across this one:
http://www.batteryholders.com/part.php?pn=BH401&original=CR1025&override=CR1025

I'll have to disassemble my PC further and see if that one will work. I'm new to messing with CMOS batteries, so I still have some questions. The clip that broke off is a positive terminal that has to be metal, right? And will the PC be able to operate without the battery, at least for testing to see if the hardware still works?
That one looks a bit strangely sized for the cell in it.

You can also look for one that has two wires leading from it and then solder the wires to appropriate metal bits exposed on the broken one. That could be easier...and safer for the motherboard... than removing the old one and soldering in a new one. All you need is a holder for any old battery cell just so it's about 3.0 volts total so even one with two AAA cells in series will work.

Your computer will work perfectly well without the CMOS battery in place, it just won't hold BIOS settings so it will always boot up with defaults. It will probably also lose time and date settings.
 

clutchc

Titan
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Agreed. That appears to be the wrong battery. Was that the battery that was in the used board when you got it?
Which motherboard?
If bought as a complete PC, which make/model 486 PC?

It's been a really long time since I've had a 286/386/486 PC. Can't remember the boards looking quite that archaic...lol.
 

FreyjasChosen

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Jan 8, 2009
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The computer is an AST Advantage! Pro 486DX/33. And yes, that is the same CMOS battery that was in it when I bought it and first opened it up. I will disassemble the computer tomorrow to get a better look at the battery holder, especially the underside.
 

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