already desoldered your bios batteries?

[Unzlbunzl]

when browsing through my (what i call) essential hardware today, i re-discovered my nice full-size AT 386DX mobo (16 memory slots, yeah), besides lots of unidentified memory modules i'll probably post later. battery acid has begun to eat some copper leads on it - will be an awful job to repair this. are those computer collectors out there beware of this threat?

[CPUShack]

this is/was a pretty common problem, and why they made lots of replacements for those soldered on batteries.

You know the ones that had velcro on them for easy attachment to the inside of the case.

[Unzlbunzl]

from what ive seen so far this external batteries where have more of ODP than ODPR

[JAC]

nasty!

[el_gecko]

Does somebody have a tip to avoid that? Could we unsolder these batteries and keep these mainboards still functionnal?

[Chiefish]

No , but i might reccommend a Rear Defroster Repair kit to rejoin those traces on the board, they also have conductive pens that can repair that break in the traces. You can usually find them at an auto parts place.

[i440bx]

I had the same Problem with my 286er Board.

I saw that the acid began to eat the Board and replaced the Battery with an High-Power Capacitor like this:
.

It has around 20Farad and thats enough vor some months witout Power.

They are called "Gold Caps"

[doccybrown]

I`m replacing this nasty NiCd-accumulators
with 3V lithium-batterys. Older mainboards
are charging the NiCd-accumulators so using
a diode is judicious. The diode (preferable a germanium-diode
which have a low forward bias of 0.2-0.3V) will only pass the
current one way - from batt to mobo (assumed the
diode is placed correctly)
Without diode you may risc the lithium-batt blows up
This works also with mobos that are using 4,5V packs!
And I have seen lithium-batterys that had ~3,0V after 8 years
of buffering, and not one leaking!
/Doccy