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Yellow Li-Ion coin cell battery with two-wire connector

Centenex Electronics

Centenex Electronics CMOS Battery 02K7078 08K8050 Yellow Li-Ion 200mAh 3V laptop replacement part

SKU CH-AAB9-ETTMD

A 200mAh 3V lithium-ion CMOS battery with a two-wire connector that fixes real-time clock errors on compatible IBM and Lenovo ThinkPad models

  • Battery TypeBattery
  • Replaces many IBM and Lenovo part numbers
  • Li-Ion chemistry delivers 200mAh at 3V
  • Yellow coin cell with two-wire connector fits listed models
  • New condition ensures reliable Real-Time Clock operation
  • Supports ThinkPad series from X30 through T570

What this part is and who needs it

This Centenex Electronics CMOS battery replaces the IBM Lenovo part numbers 02K7078 and 08K8050. It is a yellow lithium-ion coin cell rated at 200mAh and 3V with a two-wire, two-pin connector. The part fits a wide range of ThinkPad models including the X30, X31, X32, T410, T420, T430, T440s, T440p, T450s, T550, T570, W500, W510, W700, P50, P51s, R60, A31p, and several 570, A, T, R and xSeries systems. It resolves real-time clock errors caused by a depleted original cell.

Check your system before ordering

Verify that your laptop uses a two-pin connector and that the original part number matches 02K7078, 08K8050, 02K6541, 02K7075, 04W1642, 92P0986, 92P0991, 02K6572, 01AW186, 01AW187, 01LW332, 04W0010, 04W4240, 04Y1784 or 04Y1785. Confirm the model appears in the supported list such as T420, X220, W700 or P50. Ensure you are comfortable opening the chassis to reach the CMOS socket, as installation requires partial disassembly on most ThinkPad designs.

Who this suits and who should look elsewhere

This battery suits owners of the listed ThinkPad models who need a direct-plug replacement to restore date and time keeping. It is not for laptops that use a different connector style, a CR2032 holder without wires, or a higher-capacity cell. Buyers needing a battery for non-ThinkPad brands or for models not listed above should look elsewhere.

Highlights

  • Replaces many IBM and Lenovo part numbers
  • Li-Ion chemistry delivers 200mAh at 3V
  • Yellow coin cell with two-wire connector fits listed models
  • New condition ensures reliable Real-Time Clock operation
  • Supports ThinkPad series from X30 through T570

Specifications

BrandCentenex Electronics
ModelBAIBM_CMOS_02K7078
Battery TypeBattery

Questions about this item

Does the battery arrive with wires and a two-pin connector already attached, or do I need to buy a connector separately?

The replacement cell ships with two wires and a two-pin connector fitted, so no extra connector is required.

Which part number should I match — 02K7078 or 08K8050 — to be sure it fits my ThinkPad?

Both 02K7078 and 08K8050 are listed as direct replacements, along with FRU 04W1642 and ASM 0A90099.

The spec says 200 mAh 3 V; will that capacity keep the real-time clock running without the 0270 error on a T420?

Yes, the 200 mAh 3 V Li-ion cell is the specified capacity for the listed ThinkPad models including the T420 and resolves the 0270 real-time clock error.

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