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Reply 20 of 21, by Hezus

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Luke4838P wrote on 2022-05-12, 16:01:

Bump for a question.
Is the charging circuit here?

Are you certain this motherboard charges the battery? If so, you might be able to swap the battery with a ML2032 instead.

Did you manage to grab the BIOS by any chance?

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Reply 21 of 21, by Luke4838P

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Hezus wrote on 2022-05-12, 18:31:
Luke4838P wrote on 2022-05-12, 16:01:

Bump for a question.
Is the charging circuit here?

Are you certain this motherboard charges the battery? If so, you might be able to swap the battery with a ML2032 instead.

Did you manage to grab the BIOS by any chance?

For this, yes, i just need to grab it from the diskette, the trouble is from this motherboard that lacks USB interfaces and i need to use diskettes (especially when the system is Windows 95 OSR 2.5C with Plus!).
Are you sure they're fit to replace the barrel battery? for what i heard the ML-2032\LIR-2032 isn't fit for a Ni-Mh\Ni-Cd charging circuit as the lithium rechargeables need a circuit to stop it from overcharging (also considering that most likely the voltage of the + pole from the PSU will be around 4.5\4.7V and if i remember correctly the LIR 2032\ML 2032 have a maximum tolerated voltage).
I need to test it while turning on the PC to see how much current goes to the battery poles.
But i'm 99% sure that should be recharging, as there was a barrel battery there, and those ARE rechargeable that can handle higher voltages than lithium rechargeables.
Curse those barrel batteries, i would have rather drilled the DALLAS battery with a CR 2032 mod like my father's old 486 that only died a couple years ago after 25 years of use.
If that's the charging circuit, i will cut this trace and place a diode there (Schottky but i don't remember the 1NXXXX designation, small black ones that can block the voltage well).
Underneath there's nothing from the two poles of the battery, so the only trace to the + pole should be there.
I made a sketch on what i've observed, can someone tell me if this makes sense?
Edit:
There's a picture of what it looks like now with the glue removed.

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    The acid from the barrel battery seems to have just removed the protective paint.
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