Lenovo RTC Battery FRU04Y1784 - CR2032 3V Lithium Coin Cell with 2-Pin Connector

When a Lenovo ThinkPad or ThinkCentre loses its BIOS settings or system clock after shutdown, the culprit is often a depleted RTC battery. This genuine Lenovo replacement (FRU 04Y1784) restores reliable CMOS memory backup. It is a CR2032 lithium coin cell with a 2-pin connector and 80 mm cable, ready for internal installation in compatible systems.

Key specifications

• Battery type: Lithium coin cell (CR2032)
• Nominal voltage: 3 V
• Nominal capacity: 220 mAh
• Chemistry: Lithium manganese dioxide (LiMnO2)
• Connector: 2-pin (JST-style)
• Cable length: 80 mm
• Operating temperature: -20 °C to +70 °C
• Storage temperature: -20 °C to +70 °C
• Rechargeable: No

Why choose it

This battery is a direct replacement for the Lenovo FRU 04Y1784, ensuring compatibility with a wide range of ThinkPad, ThinkCentre, and IdeaPad models. Its 3 V output and 220 mAh capacity match the original specification, providing stable power for the real-time clock and CMOS memory. The attached 2-pin connector and 80 mm cable simplify installation without soldering.

Ideal use cases

• Replacing a dead RTC battery in Lenovo laptops and desktops
• Resolving BIOS reset or clock drift issues
• Preventive maintenance for aging systems

Good to know

This is a primary (non-rechargeable) battery. It should be installed internally, connecting to the motherboard's RTC battery header. The operating and storage temperature range of -20 °C to +70 °C suits typical office and home environments.