I have a Compaq Prolinea 4/25s the "clock battery" in which has long since gone dead.  I have been into the tower numerous times, but have yet to be able to locate the "clock battery" in order to replace it.  

Can anyone please advise me as to the location of it?

O.K. . . . . . It's a dinasaur, but it is still useful for my grandsons and others to type various of their school projects on. Ole Man.......  Have been looking for the location of the battery in that old guy....but so far have come up empty handed . I suspect its probably a battery which is soldered onto the motherboard. Your best bet might be to take the box into your local computer repair shop and have them take a look.......
I have found a number of locations which claim to have replacements.... but haven't found any that show a pic of it's location.  Am still looking .....


dl65  THANKS, dl65!

Based upon my several searches for it, I too had come to the conclusion that it must be an odd look'n character soldered in at some place that I don't suspect.

Should you happen to determine a general location to look in, I would greatly appreciate the info.

And, HAPPY HOLIDAYS to yeah!Yeah, judging by the age of the computer, the battery would more than likely be soldered on. Maybe you could send us some photos of close ups of parts of the motherboard?It's probably older than that pair of shoes you told the

Whipper Snapper about during your last visit.

This means I have posted 1000 loads of gibberish.

                             SNAP!Happy 1000th then!   I had an old 1989 Windows 3.1 computer once with 50 mb HDD space (well my dad did, i didn't use it until about 1996 when i was old enough to know what a computer was), and the battery ran out on that. We didn't bother finding another one, we just built the machine we got now.Well, street1, there aint many puter contraptions still around that are coal fired and steam operated!  And, I also have a KEROSENE operated one, but the price of fuel has got so high that I just shut it down!

Phoenix910, I will try to get out my newest Polaroid and make a pitchur or two of the Mother . . . . . . . board sometimes after it gets daylight here so I can see how to take it apart.Yeah, should be easy enough, couple of screws and it'll be done.I think you need a 4.5v alkaline computer battery with the
4 pin plug-in.

http://www.measham.force9.co.uk/compaq/mb/com700.htm


Below link is a picture.See if that is what is in your computer.
If so,Try radio shack ETC...

http://www.smallbattery.company.org.uk/index.htm?http://www.smallbattery.company.org.uk/sbc_840.htmPhoenix910 and street1,

THANKS to each of you for your posts and information.

street1, I can't orient my view of the "innards" of the subject puter contraption with the diagram you provided the URL for.  It's likely my inability, rather than anything else.

Phoenix910,  pursuant to your suggestion I have made photographs and am attaching them.

Again, many THANKS for your valuable input and I would appreciate any further information, suggestions and comments.The illusive "clock battery" has been found!

Attached is a picture of it.  It is located near the power SUPPLY on a second tier circuit board, i.e. there is another circuit board above / on top of it and consequently can not be seen without the removal of the top tier circuit board.

It is soldered in; is a Varta 3.6 volt 40 mA Ni/Cd; appears to be three wafer/button type batteries held together with a red hot sink material.  

Depending on the board, you may be able to remove the battery and connect an external battery to on-board pins.

 Some boards had these as an alternative backup battery connection.

I haven't found this in a motherboard manual online...so I don't know where
to lead you.

Maybe one of the other members will be better versed on this.

Check the below site.

http://www.dsmiller.com/html/Laptop-Notebook-Varta-533063030015-B-430-PC2.htm

Even though the below site is a 386mhz computer...the battery looks
right.

http://www.portablebatteries.com/b-430.html

Edit: I found today while at Wal-Mart that if you use a wireless
telephone battery.You could wire it in as a secondary power source
and just leave the old battery where it is if there are 2 wires at
the battery source ALREADY on your motherboard.

http://www.walmart.com/catalog/product.do?product_id=1841362

For the barrel shaped affair.. external batteries are available that plug into a connector on the motherboard. Also sometimes you'll have to set a jumper to tell it there's an external battery installed.

I am still looking for a motherboard diagram with your specs. to see if I
can help you with the jumper if yours has one.
street1,

In one word, "MAGNIFICENT!"

I am most appreciative of your very valuable information and I sincerely "THANK YOU!"

The existing battery appears to have three (3) pins; two (2) on the positive (+) end and one (1) on the negative (-) end.

I have now observed a notation appearing on one of several labels inside the cabinet (a photo of which is attached) that references an "External Battery Connector" (to use an Alabama Red Neck SAYING, "If it had been a snake it would have bit me!").  In fact, as you will observe, this label is a diagram that shows the location of the "External Battery Connector."  Do you think I could leave the dead battery in place and simply plug a new battery into this "External Battery Connector" without risk of any damage, etc.?

The reason I am asking about leaving the existing dead battery in place is that while I have a soldering iron and I occassionally do a bit of soldering, I am uncomfortable with the very "close quarters" of the solder points on the circuit board where the battery is located, i.e. I don't cherish the thought of heating up the solder to remove the old battery out of concern of the heat also causing a problem with adjacent solder.  

Again, THANKS! for your valuable / helpful posts, which I am very appreciative of.From all the reading I have done in the last few days.....

You are safe to leave that old barrel shaped battery
right where it is.

If you need any help again drop back by.This is the
best site I have ever came across.

Have a Merry Christmas Ole Man.

I am happy you caught me during a sane moment.