Date and time CMOS battery issue

Hi DIVYA GODHIYA,

Thank you for reaching out.

Since the CMOS/RTC battery has already been replaced but the BIOS still does not keep the correct time, and the laptop is also shutting down unexpectedly, this points more to a hardware or firmware issue than a Windows date/time setting alone.

Please try these checking steps to move forward:

1, Check the exact laptop model and match the LED code with the manufacturer’s diagnostic table.

• If this is a Dell device, the blink pattern is read amber first, then white, and the meaning can vary by model.

2, Run the built-in hardware diagnostics if the system stays on long enough (on many Dell systems, this is available from F12 > Diagnostics) and note any error codes shown.

3, Load BIOS defaults, then update the BIOS from the device manufacturer’s official support page, if an update is available.

You can also use Windows time sync as a temporary workaround by turning on Set time automatically in Settings > Time & language > Date & time so the clock can resync after startup.

If the BIOS time still resets after restart, or the laptop continues to power off, the next recommended step would be hardware service, as the RTC/power circuit or system board may need to be checked further.

I understand this is frustrating, especially after already replacing the CMOS battery. If you share the exact laptop model, it will be easier to match the LED code and narrow down the next best step. I hope this helps point you in the right direction.

Let me know if you need further assistance, feel free to ask me by clicking "Add Comment" or "Add Answer" if you cannot add comment so your response will be visible. Thanks for your effort.

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

The symptoms described (system shutting off after 10–15 minutes with a click, LED blink pattern, BIOS time not being retained even after replacing the CMOS battery) point to a hardware problem on the laptop, not a Windows date/time configuration issue.

From the provided information, Windows itself will not correct or override an earlier BIOS date on older versions, but on Windows 8 and later, changing the BIOS date to an earlier value is ignored by design and the Windows date is kept instead. However, this assumes the BIOS is capable of reliably keeping time. If the BIOS/CMOS circuitry or power path is faulty, the clock will not persist and the system can behave unpredictably, including power‑off issues.

Key points from the context:

• On Windows 8 and later, if the BIOS date is set earlier than the current Windows date, Windows will ignore that change and keep its own date, because “time does not travel backward” and BIOS date can be unreliable when hardware is failing.
• A failing or dead battery (or related hardware) can cause the BIOS to report an incorrect date/time, which is treated as unreliable.

Given that the CMOS battery has already been replaced and the BIOS still cannot retain the correct time, and the system is shutting down with a specific LED error pattern, this indicates a likely motherboard, power, or other hardware fault that cannot be corrected from within Windows.

The appropriate next step is to treat this as a hardware service issue:

1. Consult the laptop manufacturer’s documentation for the exact LED blink code (3 amber, 1 white) to identify the failing component (often system board, battery, or power subsystem).
2. Arrange hardware diagnostics and repair through the manufacturer or a qualified service center (motherboard or power circuit replacement is commonly required in such cases).

Changing time in Windows or BIOS will not resolve a failing CMOS/RTC or power circuit; the hardware must be repaired for the date/time and shutdown issues to stop.

References:

• Changes to calendar date in BIOS are not reflected in Windows
• Date and time is incorrect when a computer running Windows 8.1 or Windows Server 2012 R2 resumes from hibernate mode