Lenovo 3V 220mAh CMOS/RTC Battery for ThinkPad P15, P17, T15g, T15p, P1, X1 Extreme (5B11Q29234)

This Lenovo CMOS battery keeps your ThinkPad's real-time clock and BIOS settings alive when the main battery is removed or depleted. Unlike generic coin cells, it arrives with the correct 2-pin connector pre-attached, so it drops straight into the dedicated header on the motherboard without soldering or cable splicing.

Highlights

• 1-cell lithium manganese dioxide chemistry delivers a stable 3V output
• 220 mAh capacity matches the original specification for consistent RTC operation
• Integrated cable with 2-pin proprietary connector for a secure, plug-in fit
• Primary (non-rechargeable) cell with low self-discharge and up to 10 years shelf life
• Operating range from -20°C to 70°C covers mobile workstation thermal conditions

In daily use

When your ThinkPad starts losing date and time settings or reports a CMOS checksum error, this battery restores reliable startup behaviour. It is compatible with Lenovo ThinkPad P15 Gen 1/2, P17 Gen 1/2, T15g Gen 1/2, T15p Gen 1/2, P1 Gen 3/4, and X1 Extreme Gen 3/4. Installation is straightforward for service technicians: disconnect the old battery, connect the new one, and secure it in the coin-cell holder.

Full specifications

• Product type: CMOS battery / RTC battery
• Battery chemistry: Lithium manganese dioxide (Li-MnO2)
• Nominal voltage: 3 V
• Number of cells: 1
• Typical capacity: 220 mAh
• Form factor: Coin cell (CR2032 equivalent)
• Connector type: 2-pin proprietary connector
• Rechargeable: No (primary cell)
• Application: Real-time clock (RTC) and CMOS memory power
• Operating temperature range: -20°C to 70°C
• Shelf life: Up to 10 years
• Self-discharge rate: Low
• Mounting: Integrated cable with connector
• Safety features: Non-flammable electrolyte

Final note

This is a genuine Lenovo service part, ideal for IT departments and repair shops that need a reliable, exact-fit replacement for affected ThinkPad models.