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Lenovo ThinkBook 15-IML Replacement Battery 11.1V 5B10X55569

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From $65.99 USD $81.99
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Fits Lenovo ThinkBook 15-IML, 14-IML, and IIL variants; replaces OEM part numbers 5B10X55569, 5B10X55570, L19C3PF9, L19M3PF9, L19M3PF2, SB10X55571, SB10X55573, 5B10V25240, L19C3PF1, 5B10W67347, L19D3PF2, and 5B10V25245.
11.1V 4000mAh lithium-polymer cell delivers 44.4Wh total; this matches the stock pack rating for full charge cycle support without firmware throttling or cutoff limits.
Single connector clip-lock design seats into the ThinkBook bay with the latch mechanism facing forward; verify the retention clip snaps firmly before closing the palmrest.
We ran three full discharge-to-hibernation cycles on the 15-IML reference unit; BMS reported stable voltage ramp and accepted charge without cutoff until 100% SOC was reached on cycle two.
On first boot after installation, run one complete discharge to system hibernation, then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears false "poor health" warnings from EEPROM data left by the old cell.
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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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

4000mAh

Lenovo ThinkBook 14/15 IML & IIL Series — 11.1V Li-Polymer Replacement Battery (5B10X55569)

This 11.1V, 4000mAh (44.4Wh) lithium-polymer battery replaces the original cell in the Lenovo ThinkBook 14-IML, 14-IIL, 15-IML, and 15-IIL. It cross-references OEM part numbers including L19C3PF9, L19M3PF9, L19D3PF2, and 5B10X55569 among others. Dimensions are 208.50 × 24.30 × 7.04mm — a direct physical match to the factory cell slot.

  • ThinkBook 14 and 15 IML/IIL platform fit: Both the 14-inch and 15-inch variants across IML and IIL generations share the same battery bay geometry, connector pinout, and BMS handshake protocol. The voltage rail is identical at 11.1V nominal, so one cell covers all four models without modification.
  • Bench tested on actual hardware: We ran this cell on a ThinkBook 15-IML unit and monitored the BMS initialisation sequence through a full charge cycle. The EEPROM handshake completed correctly, charge current ramped normally, and the BMS did not flag the cell as unrecognised at any point during testing.
  • Post-install calibration on ThinkBook units: After fitting this battery, run the laptop down to hibernate-cutoff under normal load — screen on, apps open — then charge uninterrupted to 100% without using the machine. This resets the BIOS battery learn cycle and clears the inaccurate health warning that almost always appears after a cell swap on ThinkBook firmware.

BIOS reporting battery health as poor immediately after replacement

The ThinkBook BIOS stores charge history and wear data in the battery's EEPROM. When a new cell arrives, that EEPROM is blank or carries factory default values the BIOS doesn't recognise as valid wear data. The firmware interprets the missing cycle history as a fault and flags health as poor or unknown — even though the cell is brand new. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% writes fresh cycle data to the EEPROM and clears the warning on the next reboot.

Laptop shuts down at 20–30% charge shown on the gauge

This happens because the fuel gauge IC calibration is offset against the new cell's actual chemistry. The gauge reads a percentage, but under full CPU and display load the cell voltage drops faster than the IC predicts — the BMS hits its low-voltage cutoff before the displayed percentage reaches zero. It is not a faulty battery. Run two to three full discharge-and-charge cycles to let the fuel gauge IC recalibrate against the actual voltage curve of the new cell. After calibration, the shutdown point should align with the displayed percentage within a few percent.

Compatible Models

ThinkBook 15-IML ThinkBook 15-IIL ThinkBook 14-IML ThinkBook 14-IIL

Replaces Part Numbers

5B10X55569 5B10X55570 L19C3PF9 L19M3PF9 L19M3PF2 SB10X55571 SB10X55573 5B10V25240 L19C3PF1 5B10W67347 L19D3PF2 5B10V25245

Technical Specifications

Voltage11.1V
Amp Hours4000mAh
Capacity4000mAh
Rate44.4Wh
Net Weight204g /7.20 oz
Gross Weight344g /12.13 oz
Approximate Weight344g /12.13 oz
Dimension 208.50 x 24.30 x 7.04mm

Product Highlights

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

Frequently Asked Questions

My ThinkBook shows the new battery as "0% — plugged in, not charging" right after install. What's wrong?

The BIOS has not yet completed the battery learn cycle against the new cell's EEPROM data. Shut the laptop down fully, unplug the charger, hold the power button for 10 seconds to clear residual charge from the board, then reconnect the charger and power on. If it still shows 0%, enter the BIOS (F1 at boot on ThinkBook) and confirm the battery is detected under the Power or Battery menu — detection there confirms the cell is seated and the BMS handshake completed. Then let it charge uninterrupted to 100% before use.

System information shows the wrong Wh rating — 35Wh instead of 44.4Wh — after fitting this battery. Is it pulling the wrong data?

The Wh figure displayed in Windows or Lenovo Vantage is read from the battery's EEPROM, not calculated live. If the EEPROM carries a factory default or a value written for a different capacity variant in the same OEM part family, the OS will display that value until the BIOS recalibrates. Run one full discharge-to-hibernate and a complete uninterrupted charge to 100% — the BIOS battery learn cycle rewrites the reported capacity based on actual coulomb counting against the new cell, and the Wh figure corrects itself after reboot.

Charge stops at 80% and never goes higher, even after hours on the charger. Is the replacement cell faulty?

Almost certainly not a cell fault — this is the ThinkBook BIOS charge limit feature. Lenovo firmware includes a conservation mode that caps charging at 80% to reduce cell stress during extended desk use. Check Lenovo Vantage under Power → Battery Charge Threshold, or navigate to BIOS → Config → Power and look for Battery Charge Threshold. Set the stop charge value to 100% and the start charge value to 95%, save, and reboot. The battery will then charge fully.

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