John,

I had this procedure done, on my dx4-120, by a tech at my favorite local
computer store. The new 3.6volt lithium battery has long enough leads so
the tech just used velcro to stick it to the underneath side of the power
supply. If I remember correctly, my total cost was $28.00. Good luck to
Gordon Tyler.

Lee Ross

John Chin wrote:

> >Gordon Tyler wrote:
> >
> >> Hi. I've just received an almost mint '92 486dx system . . .
> >>
> >> One problem: I want to replace the clock battery. I tried to remove
> >> it but it is solidly in place between 2 prongs. Below it are 4
> >> vertical gold pins.
>
> Gordon:
>
> With those soldered-on 486 batteries, there usually is
> an external battery connector with four pins, usually
> labeled JP1 or JP2. The middle two pins (2-3) are jumpered
> to utilize the internal battery (your replacement
> candidate). Pins 3-4 are usually the CLEAR CMOS settings,
> to drain power from CMOS, to reset it to default.
>
> The replacement battery will come with a wired connector
> which has 4-female connections, with the first and last
> wired to the battery terminal and these connect to the
> external JP battery connector pins 1 and 4. Obviously,
> the external battery connector cannot be plugged in with
> pins 2-3 jumpered (internal battery), so you have to remove
> the jumper, which disables internal battery power.
>
> As has been pointed out, you should remove the old battery
> to avoid corrosive effects, although it is not necessary
> with the internal battery jumper disabled (open).
>
> Get the specified battery type and voltage (check the manual).
> Computer parts stores usually carry PC batteries for $6-$10,
> though there are some odd-ball voltage batteries that cost
> more. As Jose said Radio Shack has them. Also Best Buy and
> Circuit City may have them.
>
> Regards,
>
> John Chin
>
>

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