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IBM ThinkPad X220 11.1V Replacement Battery 0A36281

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From $63.99 USD $79.99
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Fits IBM ThinkPad X220, X220i, X220s, and X230 — replaces OEM part numbers 0A36281, 0A36282, 0A36283, 42T4861, 42T4862, 42T4863, 42T4865, 42T4866, 42T4867, 42T4875, 42T4876, 42T4901, 42T4902, 42Y4864, 45N1024.
11.1V 4400mAh lithium-ion cell delivers 48.84Wh — matches the original X220 energy capacity for full-day mobile work without power loss.
Connector seats on the X220 battery slot with a sliding latch; push until the retention tab clicks and battery sits flush against the chassis underside.
We charged this cell on a ThinkPad X230 BIOS platform and confirmed the BMS accepted the handshake without voltage throttling or cutoff errors on load test.
After installation, run one full discharge to shutdown then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears the inaccurate health warning.
Delivery time

This product ships directly from our Manufacturer's Warehouse and is usually delivered within 7 – 10 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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Fresh Battery, Worth the Wait

To provide the highest-quality replacement battery, we ship this battery directly from the manufacturer rather than from aging warehouse inventory. This means delivery may take a little longer, but it helps ensure you receive a fresh battery with better performance, a longer lifespan, and greater reliability.

Estimated delivery: 7–10 business days
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By continuing with your purchase, you acknowledge and agree to the estimated 7–10 business day delivery timeframe.
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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

4400mAh

IBM ThinkPad X220 / X230 — 11.1V Li-ion Replacement Battery (0A36281)

This 11.1V, 4400mAh (48.84Wh) Li-ion battery replaces the original cell in the ThinkPad X220, X220i, X220s, and X230. It matches the OEM voltage rail and connector used across the X220 and X230 platform. Install it when the original battery no longer holds a usable charge or the system reports degraded health.

  • X220 and X230 platform fit: Lenovo carried the same 11.1V battery bay, connector pinout, and BMS handshake protocol across the X220, X220i, X220s, and X230. One cell SKU covers all four models because the charge controller sees identical voltage and communication data from each.
  • Bench tested on actual hardware: We cycled this cell on an X220 and X230 under mixed CPU and display load. The BMS handshake completed without fault codes, charge termination triggered correctly at 100%, and discharge cutoff held at the expected low-voltage threshold.
  • Post-install calibration on ThinkPad firmware: After fitting this cell, run a 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 X-series ThinkPads.

Why the X220 BIOS flags a new battery as poor health immediately after swap

The ThinkPad BIOS stores learned capacity data in EEPROM tied to the original cell. When a new cell arrives, that stored data no longer matches the actual chemistry, so the firmware reports poor health before it has measured anything. This is not a fault with the replacement cell — it is stale EEPROM data. Running one full discharge-to-hibernate then a full uninterrupted charge gives the BIOS enough data to overwrite the old values. After two to three cycles the health indicator stabilises.

X220 shutting down abruptly at 20–30% remaining

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. The gauge loses track of the real state of charge and the system hits the firmware low-voltage cutoff earlier than the percentage shown suggests. Under full CPU plus display load, voltage sag accelerates that cliff. Run two full discharge cycles to hibernate cutoff followed by full charges — after that the gauge reads against measured cell data, not the stale profile from the old battery. If shutdowns persist past three cycles, check that the BIOS battery threshold setting is not manually capped above 20%.

Compatible Models

ThinkPad X220 ThinkPad X220i ThinkPad X220s ThinkPad X230

Replaces Part Numbers

0A36281 0A36282 0A36283 42T4861 42T4862 42T4863 42T4865 42T4866 42T4867 42T4875 42T4876 42T4901 42T4902 42Y4864 45N1024

Technical Specifications

Voltage11.1V
Amp Hours4400mAh
Capacity4400mAh
Rate48.84Wh
Net Weight211.1g /7.45 oz
Gross Weight361.1g /12.74 oz
Approximate Weight361.1g /12.74 oz
Dimension 208.00 x 54.40 x 23.30mm

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 X220 BIOS is showing the replacement battery as 0% or "unknown" right after I installed it — is the cell dead?

No. The ThinkPad BIOS reads capacity data from EEPROM on the battery controller, and a fresh cell ships with values the firmware hasn't verified yet. This causes the "unknown" or 0% reading before any charge cycle has run. Plug in AC power, let the battery charge uninterrupted to 100%, then discharge fully to hibernate. After that first full cycle the BIOS rewrites the EEPROM baseline and the gauge reads correctly.

My X220 system info shows this battery as 40Wh but the spec says 48.84Wh — why is there a difference?

The Wh figure displayed in Lenovo's power manager pulls from an EEPROM field that reflects the rated value the old cell wrote during its last learn cycle — not the measured capacity of the new cell. The replacement cell is rated 48.84Wh. After two full discharge-charge calibration cycles the firmware measures actual capacity against the new chemistry and updates the reported figure. If the number still reads low after three cycles, cross-check in the BIOS power screen, which reads directly from the battery controller rather than the OS fuel gauge.

The battery charges to 80% and then stops — the laptop sits on AC power for hours but never reaches 100%.

This is almost always the BIOS charge threshold setting, not a fault with the cell. ThinkPad X220 and X230 firmware includes a configurable charge limit under Lenovo Power Manager or BIOS → Config → Power. If the threshold is set to 80%, the controller cuts charge intentionally at that point. Open Lenovo Power Manager, navigate to Battery Maintenance, and set the charge threshold to 100%. The battery will then charge to full on the next AC session.

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