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February 26th, 2025 22:40
Dell XPS 9510 CMOS battery
XPS 15 9510
Hello,
My Dell XPS 15 9510 is intermittently forgetting its service tag, or important BIOS settings, or its real-time clock is off, and then entering manufacturing mode. The consequences of this are it will need to have the service tag reentered, the bios settings reentered, the bit locker code entered, and then the computer is operational again. This is not acceptable operation.
All the research I have done points to a potential CMOS battery failure or a CMOS chip failure on the motherboard. As far as I know, the former is fixable and the later requires a mother board replacement and hence is probably not economical.
Now, the problem is I cannot find a CMOS battery replacement for this particular model or even its location. I have looked online and I could not find any options available. Dell Parts People did not list a CMOS battery replacement for this computer.
Last year I opened up the laptop to replace the battery. During that servicing I did not see any said CMOS battery or anything which looked like it.
I have read that this computer may have a capacitor instead of a battery, or that the CMOS battery may be in the main battery itself.
Does anyone know if there is a CMOS battery for the Dell XPS 9510 or if it has a capacitor? If it has a battery, where is it and are there any replacements for it?
Finally, if anyone has any other suggestions on how to fix my problem with the lost settings and service tag, I would appreciate it.
Chino de Oro
9 Legend
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8.1K Posts
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February 26th, 2025 23:25
If you refer to your system specifications below, the battery specs indicates that coin cell battery is not supported. That would explained why no reference or documentation for coin cell battery replacement.
https://www.dell.com/support/manuals/en-us/xps-15-9510-laptop/xps-15-9510-setup-and-specifications/battery?guid=guid-736b04e3-3465-433f-8a59-b29fb604972e&lang=en-us
To fix your current problem, I suggest to perform a real time clock - RTC reset and always keep a working main battery connected.
ejn63
10 Elder
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28.6K Posts
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February 27th, 2025 00:32
CMOS (old name BIOS) settings are backed up in battery-backed RAM -- this system has no CMOS battery, so it uses the main battery for that purpose.
If the system is losing its service tag, that's a completely separate issue - that is stored in EEPROM, not battery backed RAM. If the system is losing its service tag and reverting to a blank field, that sounds like a bad EEPROM -- which means a replacement mainboard in the near future.
Erik12214
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1 Message
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April 18th, 2025 07:41
@ejn63 Even when my main battery I full, I also have persisting issues with the laptop forgetting it's time. When I perform a startup with a full battery, it gives issues and eventually launches the BIOS menu indicating system time settings are off. When you move on to start windows, the time is set at the time I closed my laptop the day before. So somehow there's some battery not doing its job I'd say. But indeed, I can not find any instruction anywhere on where a CMOS battery would be located and/or how to replace that one. Does anyone have an idea on what causes this issue and how to solve it?