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January 27th, 2025 19:27
Dell Precision 7540 - replacing CMOS /RTC battery is unbelievably arduous
I have both a 7520 and 7540 Precisions. They are getting up in years so I decided to replace the CMOS/RTC batteries on a preventive basis.
Replacing the battery on the 7520 was a snap. But replacing this little battery on the 7540 required removing the keyboard and over a dozen more screws and several ribbon connectors. If I didn't find a good Youtube video to demonstrate the procedure, I wouldn't have been able to do this.
What was Dell thinking when they designed the 7540? This coin cell battery will need to be replaced eventually, so you would think it would be more easily accessible. Is this a glaring example of "planned obsolescence"? Very disappointing, especially after being a long-time loyal customer of Dell laptop/workstations.
PCbluesky
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January 27th, 2025 19:36
Here is the Youtube video that helped me locate all the screws that need to be removed.
https://www.youtube.com/watch?v=MyRAUDmSebQ
PCbluesky
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January 27th, 2025 20:52
Another good video showing the locations of all the screws that need to come out. This is the 7530 model which is very similar to the 7540.
https://www.youtube.com/watch?v=YQfApUGbJSU
Hajikhapri
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April 25th, 2025 18:23
Hey, a bit late to the party, but what’s the cmos battery number. I am trying to order some and i see conflicting results from cmos-4 to cmos-41.
PCbluesky
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April 25th, 2025 18:42
@Hajikhapri I ordered mine from Rome Tech Batteries. The important thing is to get the battery with the right connector.
Enter your PC model # on their website to find the correct one:
https://rometechbatteries.com/
Hajikhapri
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May 12th, 2025 19:39
@PCbluesky thanks. It was the regular cmos battery for all Dell laptops that i got. And it worked