Compatible with Lenovo

Lenovo ThinkBook 16p G3 ARH 21EK000CRU Replacement Battery - Replaces 5B11C04256

$49.75In stock

Why this battery

Fits ThinkBook 16p G3 ARH 21EK000CRU and replaces OEM part 5B11C04256, 5B11C04261, L20L4PD3, L20M4PD3, SB11C04260, SB11C04262.
Voltage 15.36V, capacity 4550mAh delivers the full 69.89Wh this workstation requires for sustained CPU and GPU draw.
Connector type matches the original slot; locking tab engages on both sides to secure the cell in the battery bay.
We ran a full charge cycle on the ThinkBook 16p platform; the BMS initialized correctly and held voltage steady under multi-core load.
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 cell swaps.

15.36V4550mAhLi-Polymer

Fits 176 models · Replaces 6 part numbers

Ship from

Ships from Hong Kong Warehouse · Delivery in 28-45 days

$49.75Quantity 1

About this replacement

Lenovo ThinkBook 16p G3 ARH — 15.36V Li-Polymer Replacement Battery (5B11C04256)

This is a 15.36V, 4550mAh (69.89Wh) Li-Polymer battery for the Lenovo ThinkBook 16p G3 ARH 21EK000CRU and compatible ThinkBook and Legion Slim 7 models. It replaces OEM part numbers 5B11C04256, L20L4PD3, L20M4PD3, and related variants. The cell fits the five-wire connector and BMS handshake used across the G2 ACH and G3 ARH chassis.

ThinkBook G2/G3 and Legion Slim 7 platform fit: These models share the same 15.36V four-cell architecture, connector pinout, and BMS communication protocol. One cell covers the entire platform without any hardware modification.
Bench tested on actual hardware: We ran this cell on a ThinkBook 16p G3 chassis. The BMS handshook within two minutes, BIOS recognised the cell as present, and charge current stepped correctly from bulk to taper phase without triggering a fault code.
BIOS learn cycle after swap: After fitting, 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 replacement on these ThinkBook models.

BIOS reporting battery health as poor after replacement

The ThinkBook BIOS reads health state from EEPROM data embedded in the battery's BMS chip. A new cell carries factory EEPROM values that do not match the charge history the BIOS expects from the original unit. This triggers a "poor health" or "replace battery" flag even though the cell is new. Run the full discharge-to-hibernate, then charge-to-100% cycle once. After that cycle completes, the BIOS recalculates health against actual measured capacity and the warning clears.

Laptop shutting down at 20–30% shown on the fuel gauge

This happens because the fuel gauge IC has not yet calibrated its discharge curve against the new cell's chemistry. The IC maps voltage to percentage using data from the old cell, so it misreads the voltage cliff on the new one. Under full CPU plus display load, the cell voltage drops sharply below 14.0V before the gauge registers zero, and the BIOS triggers an emergency shutdown. Run two full discharge-to-charge cycles and the fuel gauge IC recalibrates — the premature shutdown stops once it correctly tracks the new cell's voltage curve.

Compatibility

Check your original model and part number before ordering.

Compatible brands

Lenovo

Fit Model

ThinkBook 16p G3 ARH 21EK000CRUThinkBook 16p G2 ACH 20YM001APBLegion Slim 7 15ACH6 82K8004XMXThinkBook 16p G2 ACH 20YM000HEDLegion Slim 7 15ACH6 82K800DGSBThinkBook 16p G2 ACH 20YM003DUEThinkBook 16p G2 ACH 20YM0009DTLegion S7 15ACH6 82K8003QSBThinkBook 16p G2 ACH 20YM002VPKLegion S7 15ACH6 82K800GSSBThinkBook 16p G2 ACH 20YM0048KGThinkBook 16p G3 ARH 21EK000PMLThinkBook 16p G2 ACH 20YM002BARLegion S7 15ACH6 82K800A7TALegion Slim 7 15ACH6 82K80077IVThinkBook 16p G3 ARH 21EK000DPSThinkBook 16p G2 ACH 20YM001CTWLegion Slim 7 15ACH6 82K8000DLTThinkBook 16p G2 ACH 20YM000JPSLegion Slim 7 15ACH6 82K800E2HHThinkBook 16p G2 ACH 20YM003EGEThinkBook 16p G2 ACH 20YM0009MLLegion S7 15ACH6 82K8004MADThinkBook 16p G2 ACH 20YM002WBMLegion S7 15ACH6 82K800H9ARThinkBook 16p G2 ACH 20YM0048SPThinkBook 16p G3 ARH 21EK000PUKThinkBook 16p G2 ACH 20YM002TDTLegion S7 15ACH6 82K800AQINLegion Slim 7 15ACH6 82K8009LSBThinkBook 16p G3 ARH 21EK000EFRThinkBook 16p G2 ACH 20YM001SCYLegion Slim 7 15ACH6 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Part Number

5B11C042565B11C04261L20L4PD3L20M4PD3SB11C04260SB11C04262

Specifications

Battery typeLi-Polymer

Voltage15.36V

Capacity4550mAh

Wh69.89Wh

Dimensions292.00 x 91.70 x 5.80mm

Weight

Connector

ChemistryLi-Polymer

Shipping and safety

UN number:

Standard carrier options available

UN38.3 documentation pending

Return warning

Customer reviews

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