Dell Xps 15 Cmos Battery Reset: A Complete Guide

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If you own a Dell XPS 15 laptop and are experiencing issues with the time, date, or BIOS settings, it may be time to reset the CMOS battery. In this guide, we will walk you through the process of resetting the CMOS battery on your Dell XPS 15, ensuring that you can resolve any related issues and get your laptop working smoothly again.

What is a CMOS Battery?

The CMOS battery, also known as the motherboard battery, is a small coin-shaped battery located on the motherboard of your Dell XPS 15. It provides power to the CMOS chip, which stores the BIOS settings, including the time, date, and hardware configuration of your laptop.

Why Reset the CMOS Battery?

Resetting the CMOS battery can help resolve issues such as incorrect time and date, BIOS password problems, or even booting problems. It is a useful troubleshooting step that can help reset the BIOS settings to their default state.

Step-by-Step Guide to Reset the CMOS Battery

Step 1: Power Off and Unplug Your Laptop

Before starting the CMOS battery reset process, ensure that your Dell XPS 15 is turned off and disconnected from any power source, including the charger.

Step 2: Locate the CMOS Battery

The CMOS battery is located on the motherboard of your Dell XPS 15. It is usually a small, silver, or black coin-shaped battery. Refer to your laptop’s user manual or check online resources for the exact location of the CMOS battery on your specific model.

Step 3: Remove the CMOS Battery

Using a small screwdriver or your fingers, gently remove the CMOS battery from its slot on the motherboard. Take care not to damage any other components while doing so.

Step 4: Wait for a Few Minutes

Once you have removed the CMOS battery, wait for a few minutes to ensure that all residual power is drained from the motherboard. This will help reset the BIOS settings effectively.

Step 5: Reinsert the CMOS Battery

After waiting for a few minutes, reinsert the CMOS battery back into its slot on the motherboard. Ensure that it is securely in place.

Step 6: Power On Your Laptop

Now, plug in your Dell XPS 15’s power adapter and turn on your laptop. The CMOS battery reset process is complete, and your laptop should boot up as usual.


Resetting the CMOS battery on your Dell XPS 15 can help resolve various issues related to BIOS settings. By following the step-by-step guide mentioned above, you can reset the CMOS battery easily and get your laptop back to normal functioning. If you are still experiencing any issues after resetting the CMOS battery, it is recommended to contact Dell support for further assistance.