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Compaq Prolinea 575 CMOS/Clock Battery

by dtroisi / July 14, 2005 7:11 AM PDT

I would appreciate some help! I've ordered, and received a Compaq Prolinea 575 CMOS battery. It is a Rayovac 840, 4.5v Alkaline Battery. When I opened my machine, I located a schematic showing the Location of an "internal Clock/CMOS battery" (a coin shaped lithium battery currently in place). The schematic also shows the location for connecting an "external Clock/CMOS battery" connector that would seem to accommodate the battery I received. There are instructions on the schematic for jumper positions for either "internal" or "external" Clock/CMOS battery (currently positioned for the "internal" battery) with instructions for positioning for an "external" battery.
It would seem, by changing the jumper arrangement for an "external" battery and hooking up the 4.5v alkaline battery, I should be in business and the dead lithium battery would be by-passed. Can you confirm this for me?

Thank you,
Dino R. Troisi

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Seems like a lot of work to me. . .
by Coryphaeus / July 14, 2005 11:40 PM PDT

Why not just go to a hardware store, grocery store, Radio Shack, etc. and buy a two dollar replacement for the lithium battery? I hate to ask what you paid Compaq.

Lithium batterys typically last 4-5 years.

Back to your question, "Sounds logical to me".

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i agree
by AKonny47 / July 15, 2005 1:34 AM PDT

just buy a new replacement. dont stress yourself over things that arent necesary.


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Closing the Loop
by dtroisi / July 15, 2005 8:05 AM PDT

For whoever may be interested, I have installed the connected 4.5v Alkaline CMOS/Clock replacement battery and moved the jumper as instructed on diagram. The jumper move by-passes the dead Lithium battery on the board and activates the leads for the Alkaline battery connection. I've done it, and all is well again. All systems are go. There apparently are some older boards that allow you to make the fix this way. I read somewhere some of the older boards have the CMOS/Clock battery hard wired to the board making removal virtually impossible. Anyway I hope this experience is helpful to someone.

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