I have taken the top off of an RTC unit installed on a Pentium mobo and
found an IC chip with two pins bent up out of the socket and a small
battery soldered onto these two pins.
(The battery had run down to about 0.75 volts.)
Clipped out the battery, soldered small wires from the pins to an used
lithium battery holder salvaged from a dead mobo.
Worked fine.
If you find a small battery and want to replace it, try to find a number
or voltage stamped on it and replace it with the same voltage. I think
most lithium are 3 or 3.6 volts, not sure.
Make sure you tape or heat shrink around exposed metal parts to prevent
shorting out against live parts.
Clint
On Thu, 20 Feb 2003 07:34:24 -0500 Rick Glazier
<[log in to unmask]> writes:
> Some (if not all) Dallas chips had Lithium batteries internally.
> (I have the complete specs somewhere.)
> Rick Glazier
>
> From: "Joe Lore" <[log in to unmask]>
>
> > Batteries can come in all shapes and sizes and are sometimes not
> really
> > batteries.
> >
> > There was a period of time the main board manufacturor's used a
> "RTC" or
> > "Dallas" Clock chip instead of a battery. This was common from
> 386 to P1
> > systems. They have all pretty much changed over to less costly
> batteries (
> > cr2025 etc) since then. RTC's are okay uless you leave the system
> off for
> > a great deal of time.
> >
> > The RTC was really a capacitor that got charged when the mainboard
> was
> > powered up and then would discharge
>
> The NOSPIN Group is now offering Free PC Tech
> support at our newest website:
> http://freepctech.com
>
>
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