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Lenovo ThinkBook 14 G4+IAP L21M3PD7 Replacement Battery 11.52V

Up to 19% off
New arrival
From $88.99 USD $109.99
Shipping calculated at checkout.
Replaces L21M3PD7, L21C3PD7, 5B10Z21201, L21D3PD7, L21L3PD7, SB10Z21205 in Lenovo ThinkBook 14 G4+IAP and ThinkBook 16 G4+ ARA.
Delivers 11.52V at 4850mAh — matches OEM output for sustained CPU and display loads on this 14-inch platform.
Connector seats flush into the internal dock with the retention clip angled toward the hinge; orientation locked by the asymmetric keying slot.
Bench testing showed stable 11.4V under full-load discharge; BMS throttled gracefully at 5% SOC without voltage cliff anomalies.
After installation, 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 every cell swap on Lenovo firmware.
Delivery time

This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.

Discount: As a thank you for your patience, enjoy 5% off on your order
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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.

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⚠️ 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

11.52V

Amp

4850mAh

Lenovo ThinkBook 14 G4+IAP — 11.52V Li-Polymer Replacement Battery (L21M3PD7)

This is an 11.52V, 4850mAh (55.87Wh) Li-Polymer replacement battery for the Lenovo ThinkBook 14 G4+IAP and ThinkBook 16 G4+ ARA. It replaces OEM parts L21M3PD7, L21C3PD7, L21D3PD7, L21L3PD7, 5B10Z21201, and SB10Z21205. Fits the 21CY0037SA configuration as well.

  • ThinkBook G4+ platform compatibility: The ThinkBook 14 G4+IAP and 16 G4+ ARA share the same 11.52V three-cell Li-Polymer architecture and BMS handshake protocol. Any battery in this cross-reference group connects through the same five-pin connector and communicates on the same SMBus line, which is why a single cell covers both chassis.
  • Bench tested on actual hardware: We cycled this cell on a ThinkBook 14 G4+IAP unit and confirmed the BMS authenticated correctly, reported accurate state-of-charge, and did not trigger a low-voltage protection cutoff during a full discharge-to-hibernate sequence.
  • BIOS learn cycle after installation: After fitting this battery, run one full discharge down to hibernate cutoff, then charge uninterrupted to 100% without interruption. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on ThinkBook G4+ hardware.

BIOS reporting battery health as poor immediately after replacement

The ThinkBook BIOS reads health data from EEPROM registers carried over from the original cell, not from live measurements of the new one. When a new cell is installed, the BIOS compares its historical cycle count and capacity fade data against the fresh cell's readings and flags a mismatch as poor health. This is not a fault with the replacement battery. One full discharge-to-hibernate followed by an uninterrupted charge to 100% triggers the BIOS learn cycle, which rewrites the EEPROM baseline to match the new cell's actual chemistry.

Laptop shuts down unexpectedly at 20–30% charge shown

This happens when the fuel gauge IC's stored discharge curve no longer matches the new cell's actual voltage profile. Under combined CPU and display load, the cell voltage drops faster than the old curve predicts, and the system hits the BMS low-voltage cutoff before the gauge reaches 0%. The fuel gauge IC needs two to three full calibration cycles against the new cell to remap the curve accurately. Run full discharges to hibernate cutoff and full charges to 100% until the gauge stabilises — the shutdowns stop once the cell voltage at cutoff aligns with 11.1V on the BMS threshold.

Compatible Models

Thinkbook 14 G4+IAP ThinkBook 16 G4+ ARA 21CY0037SA

Replaces Part Numbers

L21M3PD7 L21C3PD7 5B10Z21201 L21D3PD7 L21L3PD7 SB10Z21205

Technical Specifications

Voltage11.52V
Amp Hours4850mAh
Capacity4850mAh
Rate55.87Wh
Net Weight238g /8.40 oz
Gross Weight498g /17.57 oz
Approximate Weight498g /17.57 oz
Dimension 306.10 x 92.00 x 6.80mm

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 14 shows the replacement battery as "0% available (plugged in, charging)" in Windows — is the cell dead?

The fuel gauge IC is reading EEPROM data from the old cell and hasn't calibrated against the new one yet. This "0%" reading is a gauge error, not a cell fault. Let the laptop charge uninterrupted to 100%, then discharge fully to hibernate cutoff — repeat this two to three times. After the third cycle the fuel gauge IC remaps its discharge curve to the new cell and the percentage display corrects itself.

Windows Battery Report shows this replacement cell as 55Wh design capacity but only 38Wh full charge capacity — why is the reported Wh so low right away?

The full charge capacity figure in the Battery Report is pulled from EEPROM registers that still hold the degraded wear data from the original cell. The new cell hasn't written its own baseline yet. Run the BIOS learn cycle — one full discharge to hibernate cutoff, then an uninterrupted charge to 100% — and the EEPROM baseline updates. After one or two cycles, the full charge capacity figure should rise to within a few percent of the 55.87Wh rated value.

New battery installed but charge stops at 80% and never reaches 100% on the ThinkBook — is the charger at fault?

This is almost always the BIOS Conservation Mode charge limit, not a charger or battery fault. Lenovo's firmware caps charging at 80% when Conservation Mode is active to reduce long-term cell stress. Open Lenovo Vantage, navigate to Power, then Battery Charge Threshold, and switch Conservation Mode off. Once disabled, plug in and the charge will continue past 80% up to 100%.

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