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Small rectangular lithium CMOS battery with two-wire two-pin connector

ETopSell

ETopSell CMOS Battery for ThinkPad T40 T41 T42 T43

SKU CH-XZF1-HS508

Replacement 3 V lithium CMOS battery with a two-wire, two-pin connector for ThinkPad T40, T41, T42 and T43 models

  • Details2 wires – 2 pins Connector
  • Key featuresCompatible with: IBM ThinkPad T40 T41 T42 T43
  • Keeps BIOS settings alive with a 3 V lithium cell
  • Direct fit for ThinkPad T40 T41 T42 T43 models
  • Ready to install with 2-wire 2-pin connector
  • Fresh factory unit, not a pull or re-cell

Compatible ThinkPad Models

This CMOS battery fits IBM ThinkPad T40 T41 T42 T43 laptops. It uses a 2-wire 2-pin connector that matches the original motherboard header. The part restores BIOS settings and real-time-clock function when the original cell is depleted. Buyers with other ThinkPad series or non-IBM notebooks will need a different connector or voltage.

Thermals Noise and Power

The lithium cell operates at 3 V with negligible current draw. It produces no audible noise and generates no measurable heat during normal operation. No active cooling or additional power connections are required. The component simply maintains firmware memory when the main system is off.

How it compares

Measured against everything we stock in Motherboard Add-On Parts, at today’s prices. Recalculated every night.

Price $11.99
Cheaper than about 75% of the 242 comparable items (median $50.49).

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Specifications

No published specifications for this item yet.

Questions about this item

How do I install the 2-wire, 2-pin CMOS battery in a ThinkPad T40, T41, T42 or T43, and which step is often done incorrectly?

Disconnect the main battery and power adapter, then plug the 2-pin connector into the motherboard header with the keyed orientation matching the socket; the step often missed is forgetting to remove the main power sources first, which can cause a short.

What maintenance or replacement will the 3 V lithium CMOS battery need over time in a ThinkPad T40, T41, T42 or T43?

The battery is non-rechargeable and typically lasts several years; when the system clock starts losing time or BIOS settings reset after power-off, replace it with an identical 2-wire, 2-pin 3 V lithium cell.

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