What Is a BIOS CMOS Battery?

The BIOS CMOS battery is a small battery located on the motherboard of a computer. Its primary function is to power the Complementary Metal-Oxide-Semiconductor (CMOS) chip, which stores essential system settings and the real-time clock (RTC) when the computer is turned off. The BIOS, or Basic Input/Output System, is firmware that initializes hardware during the booting process before handing control over to the operating system. The CMOS chip retains information such as system time, date, and hardware configuration settings, which are crucial for the computer to function correctly. Without a functioning BIOS CMOS battery, the computer may lose these settings every time it is powered down, leading to issues like incorrect system time and failure to recognize hardware components. Typically, the BIOS CMOS battery is a coin-cell battery, often a lithium type, and has a lifespan of several years. When it begins to fail, users may notice symptoms such as frequent BIOS error messages, incorrect system time, or the need to reset BIOS settings after every shutdown. Replacing the BIOS CMOS battery is a straightforward process that involves opening the computer case, locating the battery on the motherboard, and swapping it out for a new one. This simple maintenance task can help ensure that the computer operates smoothly and retains its settings over time.

How to Replace a BIOS CMOS Battery?

Replacing a BIOS CMOS battery is a relatively simple task that can be performed by most computer users with basic technical skills. First, ensure that the computer is powered off and unplugged from the electrical outlet to avoid any electrical hazards. Next, open the computer case by removing the screws or latches that secure it. Once the case is open, locate the BIOS CMOS battery on the motherboard. It is typically a round, silver-colored battery, similar in appearance to a coin. Take note of the battery's orientation, as it is essential to install the new battery in the same way. Carefully remove the old battery by either pressing the retaining clip or gently lifting it out of its socket. After removing the old battery, take the new battery and insert it into the socket, ensuring it is oriented correctly. Once the new battery is in place, close the computer case and secure it with screws or latches. Finally, plug the computer back in and power it on. You may need to enter the BIOS setup to reconfigure any settings that were lost during the battery replacement process, such as the system time and date. After completing these steps, the computer should function normally, with the BIOS retaining its settings even when powered off.

Signs of a Failing BIOS CMOS Battery.

A failing BIOS CMOS battery can lead to several noticeable symptoms that indicate it may need replacement. One of the most common signs is the computer displaying incorrect system time and date. If you notice that your computer's clock resets to a default time or date every time you power it on, this is a strong indication that the CMOS battery is no longer holding a charge. Another sign is the appearance of BIOS error messages during startup, such as "CMOS Checksum Error" or "CMOS Battery Failure." These messages indicate that the BIOS is unable to access the stored settings due to a depleted battery. Additionally, you may experience issues with hardware recognition, where the computer fails to recognize certain components, such as hard drives or peripherals, which can be attributed to lost BIOS settings. If you find yourself having to reconfigure BIOS settings frequently, such as boot order or hardware configurations, this can also signal a failing battery. In some cases, the computer may fail to boot entirely, or it may hang during the startup process. If you encounter any of these symptoms, it is advisable to check the BIOS CMOS battery and consider replacing it to restore normal functionality.

How Long Does a BIOS CMOS Battery Last?

The lifespan of a BIOS CMOS battery can vary depending on several factors, including the type of battery used, the motherboard design, and the overall usage of the computer. Generally, a typical BIOS CMOS battery, which is often a lithium coin-cell type, can last anywhere from three to ten years. In many cases, users may find that their battery lasts closer to the upper end of this range if the computer is used regularly and maintained properly. However, if the computer is rarely used or is kept in a location with extreme temperatures, the battery may deplete more quickly. It is important to note that while the battery is designed to last several years, it is not uncommon for users to experience battery failure sooner, especially in older systems. Regularly checking the system time and date, as well as monitoring for any signs of a failing battery, can help users anticipate when a replacement may be necessary. When the battery does begin to fail, it is advisable to replace it promptly to avoid potential issues with system settings and hardware recognition. Keeping a spare BIOS CMOS battery on hand can also be a good practice for users who want to ensure their systems remain operational without interruption.

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bios cmos battery8 factories verified

Shenzhen Lus Technology Co., Ltd

9 yrs ·5.0

Main Products:

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OEM/ODM Service

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Sample Available

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Liyuan Battery Technology (Yichun) Co., Ltd.

7 yrs ·5.0

·Manufacturer/Factory & Trading Company

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Jiangxi, China

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OEM/ODM Service

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Sample Available

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Cr2032 Battery Welded Wire CMOS Battery with BIOS Strip on Laptop Motherboard

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Shenzhen Donbatt Tech Limited

Country/Region:

Guangdong, China

Company Profile:

Established in 2007 and exporting in 2016, Shenzhen EastBattery Tech Co., Ltd. is a professional manufacturer of various batteries. Own our brand"DONBATT",

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Super BIOS CMOS Cr2032 3V Lithium Button Cell Battery with 1.25mm 2pins Plug /Connector for Computer Laptop Mainboard

Negotiable

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Cr2032 3V Lithium Button Cells BIOS CMOS Battery with Lead and Connector Plug for Computer Motherboard PCB

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Shenzhen Elsky Technology Co., Ltd.

17 yrs ·5.0

·Manufacturer/Factory & Trading Company

Main Products:

Motherboard, Mini PC, OPS Mini PC, Industrial PC

Country/Region:

Guangdong, China

R&D Capacity:

OEM/ODM Service

Sample Service:

Sample Available

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Found in 2 0 0 9, ELSKY is specially engaged in the R & D, manufacturing, sales and system integration of industrial motherboard for O P S P C, Mini P C and Industrial P C, All-in-one P C, Digital Signage, Advertising L C D, Network, P O S, Tele Communication and other industries. Meanwhile, We offer O E M/ O D M service for global customers.

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Beijing Teket Innovation Technology Company Limited

24 yrs

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Beijing, China

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Teket Innovation focus on:

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EMB-BT4 Industrial Motherboards Intel Celeron J1900/N2807 for AAEON

US$500.00-700.00

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Shenzhen Piesia Electronic Technology Co., Ltd. Was founded in July 29th, 2009. We provide various types of Industrial grade embedded products, especially the 3.5" and mini-ITX mtherboards. We integrate R& D, production and sales. Our company is committed to providing users with the latest industrial control products and professional technical services.

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Telefly Telecommunications Equipment Co., Ltd.

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Network Card, Graphics Card

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Guangdong, China

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OEM/ODM Service

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Shenzhen Telefly Telecommunications Equipment Co., Ltd., was established in 2010. It is a professional hardware equipment company integrating product development, sales and service. It is located in Shenzhen, Guangdong Province, with a total investment of 50 million yuan.

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Shenzhen LCDKIOSK Technology Co., Ltd.

5.0

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2025 Elsky 3th Generation Fanless Industrial Mini PC Core I5-3317u Rugged DC12V X86 128GB 512GB SSD 1037uintegrated 2GB 4GB RAM M618

2025 Nvidia Mx150 Independent Graphics Card OPS Mini Computer Skylake CPU

Elsky Thin Fan Industrial PC with CPU Kaby Lake 7th Gen Core I3-7100u 7130u 4K UHD Display 2.5inch SSD/HDD M818

Elsky OPS-H310 OPS PC Support 8/9th Gen LGA1151 CPU with HDMI Dp

EMB-BT4 Industrial Motherboards Intel Celeron J1900/N2807 for AAEON

Ga-Imb1900n Ga-Imb1900tn Mini Itx Motherboard Intel Quad Core Celeron J1900 Soc DDR3l 16GB Intel Graphics Dx 10 for Gigabyte

Ecb-920A-A11 COM Express Evaluation Carrier Board for Aaeon

Mini-Itx Motherboard with 12th/13th/14th Generation Intel Core LGA 1700 for Aaeon

Intel 14th Gen Ultra 5 125h Ultra 7 155h Nano Itx Motherboard 2 LAN 2*COM 4*USB 2*DDR5 Edge Computing X86 Industrial Ai PC Motherboard

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6th Gen. Intel? Core? I7-6600u Cincoze Di-1000 Di-1000-I7 Optional I5 I3

Indoor Ad Player Motherboard H110 Touch Kiosk System Board

Intel 14th Gen Ultra 5 125h Ultra 7 155h Nano Itx Motherboard 2 LAN 2COM 4USB 2*DDR5 Edge Computing X86 Industrial Ai PC Motherboard

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