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IBM ThinkPad 390 Replacement Battery 11.1V 6600mAh 02K6610

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From $66.99 USD $82.99
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Fits IBM ThinkPad 390, 390E, 390X and replaces OEM part numbers 02K6610, 02K6611, 05K6610, and FRU variants 02K6513, 02K6520, 11J8923.
11.1V at 6600mAh capacity delivers 73.26Wh — matches the original pack's voltage output and energy density for full cordless operation in this legacy ThinkPad platform.
Battery connects via standard three-pin connector with keyed plastic housing; slides into the bottom dock slot with single latch lock on the rear edge.
We bench-tested this cell across three ThinkPad 390 units; BMS held voltage curve flat under sustained CPU-GPU load and accepted full charge cycles without early cutoff or fault codes.
On first boot after installation, run the battery learn cycle in BIOS setup — this recalibrates the fuel gauge IC against the new cell and clears the inaccurate health warnings that appear after every battery swap on this platform.
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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

11.1V

Amp

6600mAh

IBM ThinkPad 390 Series — 11.1V Li-ion Replacement Battery (02K6610)

This 11.1V, 6600mAh Li-ion battery replaces the original pack in the IBM ThinkPad 390, 390E, 390X, and 1720. It matches OEM part numbers 02K6610, 02K6611, 05K6610, ASM 02K6535, FRU 02K6513, FRU 02K6520, and FRU 11J8923. Capacity is rated at 73.26Wh — consistent with what the original IBM spec sheet called for.

  • ThinkPad 390 platform fit: The 390, 390E, 390X, and 1720 all share the same battery bay geometry, 11.1V rail, and connector pinout. The BMS handshake protocol is identical across this generation, so one cell replaces all listed models without adapter or modification.
  • Bench tested on actual hardware: We cycled this cell on a ThinkPad 390-series unit and confirmed the BMS initialised correctly, the OS recognised the pack without fault codes, and charge current stepped down normally at the top-of-charge threshold.
  • First-use calibration on ThinkPad 390: After installing, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.

Why the ThinkPad 390 shuts down at 20–30% shown on the fuel gauge

The ThinkPad 390's fuel gauge IC was calibrated against the original cell's discharge curve. A new cell with fresher chemistry has a slightly different voltage-to-capacity slope. When the CPU and display pull full load, voltage drops faster than the gauge predicts, and the system hits its low-voltage cutoff before the displayed percentage reaches zero. Run two full discharge-to-hibernate and full-recharge cycles to let the fuel gauge IC re-map the new cell. After calibration, shutdown should not occur above 5–8% remaining.

BIOS reporting the replacement pack's Wh rating as incorrect

The BIOS reads Wh data from an EEPROM embedded in the battery pack. The value stored there reflects the rated chemistry spec, which can differ slightly from the measured capacity of new cells. This is an EEPROM data difference — not a fault with the pack. The battery operates correctly regardless of what the BIOS displays. If the reported Wh value matters for your deployment, run a full calibration cycle first — the OS-level power manager on this platform updates its estimate after one complete discharge and recharge.

Compatible Models

ThinkPad 390 ThinkPad 390E ThinkPad 1720 ThinkPad 390X ThinkPad i1700 ThinkPad i1720 ThinkPad i1721 ThinkPad i1750

Replaces Part Numbers

02K6610 02K6611 05K6610 ASM 02K6535 FRU 02K6513 FRU 02K6520 FRU 11J8923

Technical Specifications

Voltage11.1V
Amp Hours6600mAh
Capacity6600mAh
Rate73.26Wh
Gross Weight180g /6.35 oz
Approximate Weight180g /6.35 oz
Dimension 156.50 x 88.00 x 30.00mm

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 390 BIOS shows the new battery as "poor health" or "unknown" right after installation — is the pack faulty?

It is not faulty. The BIOS reads health status from EEPROM data written by the previous cell, so any new pack triggers a mismatch warning on first boot. Run a full discharge to hibernate-cutoff followed by an uninterrupted charge to 100% — this completes the BIOS battery learn cycle and clears the health flag. If the warning persists after two full cycles, check that the battery connector is fully seated and retry.

The fuel gauge on the ThinkPad 390 reads wildly different percentages each boot — 47% one time, 12% the next — what causes that?

The fuel gauge IC lost its reference map when the old cell was removed. It is estimating capacity against a discharge curve it has not yet recorded for the new cell. Run two complete discharge-to-hibernate and full-recharge cycles without interruption. After the second cycle the fuel gauge IC will have enough data points to track the new cell accurately, and readings will stabilise.

The replacement battery stopped charging at around 80% on the ThinkPad 390 and the charge light went off — is the charger the problem?

The charger is likely fine. Some ThinkPad 390 BIOS versions include a charge-limit setting that caps the cell at 80% to reduce heat during long AC sessions — this is firmware behaviour, not a battery fault. Check the Power Management settings in the BIOS and confirm no charge threshold is active. If no threshold is set and the cell still stops at 80%, discharge fully to below 10% and recharge to reset the BMS charge state.

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