XPS 15 9570 CMOS battery

Question

Hi there,

My laptop is showing some odd behaviour, and I'm wondering if it is down to the CMOS battery which seems to be failing.

Main symptom is the system losing date/time and BIOS settings when the main battery runs down to empty.

There are also issues around misreporting of main battery charge levels (particularly when running on the battery for a few hours - e.g. I can shut it down with 50% remaining, and then it is reading 5% when I turn it on again), and shutdowns on Windows load when running on battery (these may not be down to the CMOS battery, but it makes sense to rule it out first).

I know these are not easy to replace, but I'm struggling to even work out what replacement battery I need, and any other parts (e.g. thermal compound, etc.). I'm based in the UK - any advice? Thanks.

ejn63 · Answer

It sounds like both the main battery and the cmos/reserve battery need to be replaced.

The battery is this one

https://www.amazon.com/CMOS-Battery-DELL-9343-9350/dp/B08LBR15JK

and the service manual is here:

https://www.dell.com/support/home/en-us/product-support/product/xps-15-9570-laptop/docs

tony_ack · Answer

Thanks for the reply.

The main battery was replaced a couple of months ago with a new genuine Dell battery.

The item you have linked to is not available in the UK - I'm struggling to find one that is available here.

filbert · Answer

@tony_ack wrote:

The item you have linked to is not available in the UK - I'm struggling to find one that is available here.

I guess you mean the CMOS battery in a plastic casing with wires and connector?

If you're willing to do a little more work, you can use a standard CR2032 coin battery that is widely available. You just need to carefully disassemble the current casing and remove the contacts to reuse on the new battery. I did it recently, so can help you with any questions.

This will give you the idea:
https://youtu.be/Mzr7Mbm1L3k
https://youtu.be/5DdAZrTZjEM

Do NOT solder the contacts to the new battery, even though some videos suggest that. The heat from a soldering gun can easily cause the battery to explode and you could be hurt. I used aluminum tape to fasten the contacts to the battery, then wrapped it in electrical tape.

trouble_bubble · Answer

@filbert​  I thought about doing the same but ended up ordering a ML1220 battery instead since it's rechargeable, (which a CR2032 isn't) Figured it might be getting some charge from the laptop? If so it would be dangerous to seat a regular battery there.

XPS

XPS 15 9570 CMOS battery

Was this post helpful?