CMOS Battery Lenovo 20VF 5B10S34080 - motherboard backup coin cell

CMOS Battery Lenovo 20VF 5B10S34080 is a motherboard backup coin cell designed to maintain BIOS settings and the system clock when the main power supply is disconnected. It supplies a stable low-current source to the motherboard’s CMOS memory so time, date and BIOS configuration are retained during storage, transport or maintenance. The battery is intended for Lenovo systems that require a compatible coin cell for reliable retention of firmware settings.

Advantages

The coin cell provides consistent low-current output suitable for long-term standby duty, ensuring that BIOS memory and real-time clock remain powered between uses. Its compact form factor fits directly into compatible motherboard holders without modifying the board, and the design supports easy replacement during repairs or upgrades. Using a matching backup battery reduces the need to reconfigure system settings after power loss.

Suitable for

• Preserving BIOS settings and CMOS memory in desktop and laptop motherboards
• Maintaining system clock and date during storage or transport
• Motherboard maintenance, repair and component replacement
• System refurbishment and testing where stable clock and BIOS retention are required

Key specifications

• Form factor: coin cell compatible with standard motherboard CMOS holders
• Output: low-current standby output suitable for CMOS memory and real-time clock
• Voltage: nominal coin cell voltage appropriate for motherboard backup use
• Operating temperature range: suitable for typical computer environment conditions
• Physical dimensions: compact, designed for direct insertion into onboard battery holder

How to use

Power off the computer and disconnect it from mains power before replacing the battery. Locate the motherboard CMOS battery holder and carefully remove the existing coin cell using appropriate tools or anti-static precautions. Insert the replacement battery with correct polarity, ensuring it sits securely in the holder. Reconnect power and verify BIOS settings and system time; enter BIOS setup if required to confirm or adjust configuration.

Usage recommendations

Store the battery in a cool, dry place and avoid exposure to extreme heat or humidity. Replace the coin cell when the system reports CMOS or real-time clock errors, or as part of planned maintenance to prevent loss of BIOS settings. Handle the battery with care and dispose of used cells according to local regulations for battery recycling.