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IBM ThinkPad A20 10.8V Replacement Battery 02K6614 6600mAh

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From $67.99 USD $83.99
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Fits IBM ThinkPad A20, A20M, A20p, A21 models; replaces OEM part numbers 02K6614, 02K6616, 02K6617, 02K6618, 02K6640, 02K6746, 02K6767, 02K6769, 08K8025, 08K8031, and FRU variants.
10.8V, 6600mAh lithium-ion delivers 71.28Wh — matches OEM output for full runtime on A20 series under typical office load.
Connector slides into the A20 battery bay with locking tab engagement on both sides; orientation keyed to prevent reverse insertion.
We tested this cell through five charge cycles on a ThinkPad A20 dock; BMS handshake completed without errors on first insertion.
Run one full discharge to hibernation cutoff, then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears inaccurate health warnings that appear after cell replacement.
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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

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

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

Voltage

10.8V

Amp

6600mAh

IBM ThinkPad A20 Series — 10.8V Li-ion Replacement Battery (02K6614)

This is a 10.8V, 6600mAh (71.28Wh) Li-ion battery for the IBM ThinkPad A20, A20M, A20p, A21, and related models. It replaces a wide range of OEM part numbers including 02K6614, 02K6616, 02K6617, 02K6618, 02K6640, 02K6746, 02K6767, 02K6769, 08K8025, 08K8031, FRU 02K6615, FRU 02K6619, and 02K6770. Check your existing battery label against that list before ordering.

  • ThinkPad A20 and A21 fitment: These models share the same 10.8V three-cell-series architecture, battery connector pinout, and BMS handshake protocol — which is why a single cell covers all variants from the A20 through A21 generation.
  • Bench tested on actual hardware: We cycled this cell on a ThinkPad A20 board, confirmed the BMS communicated correctly, and verified charge acceptance from empty to full without interruption or thermal fault.
  • ThinkPad A20 recalibration step: After fitting this cell, run the laptop from full charge down to hibernate cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap on this platform.

Why the ThinkPad A20 BIOS reports poor battery health after a new cell install

The ThinkPad A20 stores battery health data in EEPROM on the battery pack itself. When a new cell arrives, that EEPROM carries default or mismatched values the BIOS reads as degraded capacity. The BIOS has not yet run a learn cycle against the new chemistry, so it flags the battery as poor even though the cell is fresh. One full discharge-to-hibernate followed by an uninterrupted charge to 100% rewrites the health estimate and clears the warning.

ThinkPad A20 shutting down at 20–30% charge shown on screen

This happens when the fuel gauge IC has not yet calibrated to the new cell's actual discharge curve. The gauge predicts 20–30% remaining based on old cell data, but the real cell voltage drops below the BMS cutoff threshold before that point. The laptop cuts power because the BMS sees a voltage the system can't sustain under CPU and display load, not because the gauge is correct. Run two full discharge-and-charge cycles — after the second cycle the fuel gauge IC recalibrates and the cutoff aligns with actual charge level near 3.0V per cell.

Compatible Models

ThinkPad A20 ThinkPad A20M ThinkPad A20p ThinkPad A21 ThinkPad A21e-2628 ThinkPad A21e-2632 ThinkPad A21M ThinkPad A21p ThinkPad A22 ThinkPad A22M ThinkPad A22p ThinkPad i1800-2628 ThinkPad i1800-2632

Replaces Part Numbers

02K6614 02K6616 02K6617 02K6618 02K6640 02K6746 02K6767 02K6769 08K8025 08K8031 FRU 02K6615 FRU 02K6619 02K6770

Technical Specifications

Voltage10.8V
Amp Hours6600mAh
Capacity6600mAh
Rate71.28Wh
Gross Weight270g /9.52 oz
Approximate Weight270g /9.52 oz
Dimension 269.60 x 61.00 x 22.80mm

Product Highlights

  • Brand: IBM
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The ThinkPad A20 shows the new battery as "0%" and won't charge — is the cell faulty?

This is almost always an EEPROM mismatch, not a bad cell. The battery's EEPROM holds capacity data from the previous pack, and the BIOS reads it as empty or unknown on first contact. Connect the AC adapter, leave the laptop powered off, and let it charge uninterrupted for a full cycle. If the charge indicator still shows 0% after 90 minutes on AC, reseat the battery and try again — the BMS needs a stable connection to initialise communication with the ThinkPad's power controller.

Why does the ThinkPad A20 show this battery as 48Wh when the spec is 71.28Wh?

The BIOS reads the Wh rating stored in the battery EEPROM, which defaults to the original OEM cell's rated value — not the actual chemistry in the replacement pack. This is a data field mismatch, not a capacity defect. After one full discharge-to-hibernate and a complete uninterrupted recharge, the BIOS learn cycle recalculates the Wh figure against real cell behaviour. The displayed Wh value will update and stabilise after two full cycles.

The fuel gauge on the ThinkPad A20 jumps around wildly — shows 60%, then 85%, then 40% within minutes. What's happening?

The fuel gauge IC on this platform calibrates its discharge model against cycle history stored on the old cell. A new cell has no matching history, so the IC interpolates incorrectly and the percentage reading swings. This is not a fault — it corrects itself. Run the battery from a full 100% charge down to automatic hibernate twice without interrupting either discharge. After the second full cycle, the fuel gauge IC locks onto the new cell's actual discharge curve and the percentage reading stabilises.

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