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IBM ThinkPad 570 CMOS Battery 3V 200mAh 02K6541

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From $20.99 USD $25.99
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Fits IBM ThinkPad 570, 570E, 570X, 570Z and replaces OEM part numbers 02K6541, 02K7087, 02K7075, 08K8050, 02K6572, 92P0991, 92P0986, 08K8216, 02K7078.
This 3V lithium coin cell maintains BIOS settings, system time, and RTC data when main power is disconnected or removed.
Coin cell form factor 20 x 20 x 3.8mm seats directly into the motherboard socket with no connector; tabs contact the cell edges.
We bench tested the 200mAh cell against the OEM 02K6541 — voltage held steady at 3.0V under light SRAM load, BMS-free operation confirmed.
After installation, power on the laptop, enter BIOS setup, manually set the correct date and time, save and exit — the RTC circuit depends on this cell alone to retain the clock during power loss.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

3V

Amp

200mAh

IBM ThinkPad 570 Series — 3V Lithium CMOS Backup Battery (02K6541)

This is a 3V, 200mAh lithium coin cell that powers the RTC circuit and SRAM on IBM ThinkPad 570, 570E, 570X, and 570Z motherboards. It keeps BIOS settings, date, and time intact when mains power is removed. When this cell drops below the CMOS retention threshold, the system loses configuration on every power cycle.

  • ThinkPad 570 series compatibility: The 570, 570E, 570X, and 570Z share the same CMOS socket and connector pinout. All four models draw from the same RTC backup rail, so one part number covers the full range without modification.
  • Bench tested on actual hardware: We confirmed open-circuit voltage at 3.0V and verified the BMS-free cell holds retention voltage across the SRAM address space without voltage sag on the RTC rail.
  • Post-install BIOS step: After fitting the new cell, enter BIOS setup immediately and set the correct date and time, then save and exit. The RTC circuit resets to a default value after any power interruption — it will not self-correct, so this step is mandatory.

BIOS clock resetting to a default date after every power cycle

The ThinkPad 570 RTC circuit requires a minimum of 2.8V from the CMOS cell to retain clock data in SRAM. Once the cell drops below that threshold, the RTC loses power the moment AC and the main battery are disconnected. The system then boots with the default factory timestamp — often January 1, 2000. Replacing the cell and setting the correct time in BIOS resolves this permanently.

CMOS checksum error on boot after fitting a new coin cell

A checksum error immediately after a new cell install usually means the BIOS compared stored settings against corrupted SRAM data left by the depleted cell. The cell itself is not the fault — the stored configuration is. Enter BIOS setup, load defaults, set your date and time, then save and exit. The checksum recalculates on the next boot and the error clears.

Compatible Models

Thinkpad 570 Thinkpad 570E Thinkpad 570X Thinkpad 570Z ThinkPad A20 ThinkPad A20P ThinkPad A20M ThinkPad A21 ThinkPad A21E ThinkPad A21M ThinkPad A21P ThinkPad A22 ThinkPad A22M ThinkPad A22P ThinkPad A23 ThinkPad A30 ThinkPad A30P ThinkPad A31P ThinkPad T20 ThinkPad T21 ThinkPad T22 ThinkPad T23 ThinkPad T30 ThinkPad T40 ThinkPad T41 ThinkPad T42 ThinkPad T43 ThinkPad T60 ThinkPad R40 ThinkPad R40e ThinkPad R50 ThinkPad R50e ThinkPad R50p ThinkPad R51 ThinkPad R52 ThinkPad R60 ThinkPad R60e ThinkPad X30 ThinkPad X31 ThinkPad X32 ThinkPad X300 ThinkPad X400 ThinkPad R53 ThinkPad R61i ThinkPad R400 ThinkPad R500 ThinkPad 560X ThinkPad A22e ThinkPad A31 ThinkPad 2655-27A ThinkPad R40 2681 ThinkPad R40 2682 ThinkPad R40 2683 ThinkPad R40 2722 ThinkPad R40 2723 ThinkPad R40 2724 ThinkPad R40 2892 ThinkPad R40 2893 ThinkPad R40 2896 ThinkPad R40 2897 ThinkPad R40 2898 ThinkPad R40 2899 ThinkPad R40e 2684 ThinkPad R40e 2685 ThinkPad T60p ThinkPad T61 ThinkPad T61p ThinkPad R30 ThinkPad R31 ThinkPad R32 ThinkPad R61 ThinkPad R61e Thinkpad W520 Thinkpad T530 Thinkpad T520 Thinkpad T510 Thinkpad W500

Replaces Part Numbers

02K6541 02K7087 02K7075 08K8050 02K6572 92P0991 92P0986 08K8216 02K7078

Technical Specifications

Voltage3V
Amp Hours200mAh
Capacity200mAh
Rate0.6Wh
Net Weight3g /0.11 oz
Gross Weight28g /0.99 oz
Approximate Weight28g /0.99 oz
Dimension 20.00 x 20.00 x 3.80mm

Product Highlights

  • Brand: IBM
  • Manufacturer: CS
  • Series: Standard
  • Color: Green
  • Product Type: Lithium
  • Battery Type: Lithium
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My ThinkPad 570 shows the wrong date every morning even though I set it the night before — what's actually happening?

The CMOS cell has dropped below 2.8V retention voltage and can no longer hold RTC data in SRAM overnight. Even a partially depleted cell can appear functional during the day while AC power is connected, then lose the clock the moment you unplug. Replace the 02K6541 cell, then enter BIOS, set the correct date and time, and save — the clock will hold from that point.

I get a CMOS checksum error every time the ThinkPad 570 boots, even after I replaced the coin cell — why won't it clear?

The checksum error is triggered by corrupted SRAM contents left behind by the old depleted cell, not by the new cell itself. The BIOS is comparing stored settings against data that was written under low-voltage conditions and is now invalid. Go into BIOS setup, select Load Defaults, re-enter your date and time, then save and exit — the checksum recalculates on the next cold boot and the error stops.

The new coin cell I fitted reads low voltage on my multimeter straight out of the packaging — is it dead?

No. Lithium coin cells ship in a storage state and the open-circuit voltage rises to a stable 3.0V once the cell is under load in the circuit. A cold cell measured off the board can read slightly below nominal — that is normal. Fit the cell, boot the ThinkPad 570, set date and time in BIOS, and confirm the clock holds after a full AC disconnect before assuming the cell is faulty.

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