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How to identify and replace Dell Inspiron 8100 cmos battery

by laptophelp9000 / January 21, 2011 10:16 PM PST

Much appreciated if anyone can advise on this. I think my cmos battery is dead so have opened my laptop to determine what type of cmos battery the laptop uses. I have now opened it but cannot identify the cmos battery.

I have added a link to an image, and highlighted what I think is the battery. But it seems to be permanently attached to the motherboard...

Is this the correct thing that I am looking at? If so how does one remove and replace this?

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Didn't find a CMOS battery but
by R. Proffitt Forum moderator / January 22, 2011 2:18 PM PST
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by laptophelp9000 / January 28, 2011 6:05 PM PST

This document is most helpful, thanks-you. Will see how I get along.

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by R. Proffitt Forum moderator / January 29, 2011 12:44 AM PST
In reply to: Thanks

Your highlight was a tad thin so I didn't see it the first time I looked. I am in electronics design and that part looks like an surface mount inductor coil or "not a battery."

The reserve battery should be good for years. Figure 2 to 5 but your post is light on detail.

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Initial symptoms
by laptophelp9000 / February 19, 2011 12:57 AM PST
In reply to: BTW.

Just to explain why I was thinking it was the reserve battery.

My main battery had stopped working some time ago, and I could only work directly off the mains. The laptop then started displaying a message about no date and time settings. Initially it would do this intermittently. I would then set these, and the laptop would boot up. But this became more frequent. Initially, I thought it was just because I hadn't powered it up for some time, but it started to do this every time I powered it up. More recently I was not even able to do this, it would not let me go into the set-up at all, I would simply get a prompt in the middle of a black screen.

I have had this laptop since about 2002..


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Ahh, that's good to know.
by R. Proffitt Forum moderator / February 19, 2011 1:30 AM PST
In reply to: Initial symptoms

Those dead batteries usually stress the circuits on the mainboard leading to further issues. While I know to never leave old batteries in laptops this information is not published by the makers. Why should they?

The story is complete and the symptoms are consistent with failed batteries.

Remember that at 300 cycles for most batteries you are well beyond the service life of any battery.

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reserve batteries [cmos battery] are located:
by unkledaddy / December 18, 2011 8:09 PM PST
In reply to: Initial symptoms

if you haven't located that's right under the palm rest section between the plastic and the metal plate....and it's a string of little round pen light sized batteries covered in plastic stuff

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