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Lenovo ThinkBook 16p G3 Replacement Battery 15.36V 4550mAh

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From $96.99 USD $119.99
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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.
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

15.36V

Amp

4550mAh

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.

Compatible Models

ThinkBook 16p G3 ARH 21EK000CRU ThinkBook 16p G2 ACH 20YM001APB Legion Slim 7 15ACH6 82K8004XMX ThinkBook 16p G2 ACH 20YM000HED Legion Slim 7 15ACH6 82K800DGSB ThinkBook 16p G2 ACH 20YM003DUE ThinkBook 16p G2 ACH 20YM0009DT Legion S7 15ACH6 82K8003QSB ThinkBook 16p G2 ACH 20YM002VPK Legion S7 15ACH6 82K800GSSB ThinkBook 16p G2 ACH 20YM0048KG ThinkBook 16p G3 ARH 21EK000PML ThinkBook 16p G2 ACH 20YM002BAR Legion S7 15ACH6 82K800A7TA Legion Slim 7 15ACH6 82K80077IV ThinkBook 16p G3 ARH 21EK000DPS ThinkBook 16p G2 ACH 20YM001CTW Legion Slim 7 15ACH6 82K8000DLT ThinkBook 16p G2 ACH 20YM000JPS Legion Slim 7 15ACH6 82K800E2HH ThinkBook 16p G2 ACH 20YM003EGE ThinkBook 16p G2 ACH 20YM0009ML Legion S7 15ACH6 82K8004MAD ThinkBook 16p G2 ACH 20YM002WBM Legion S7 15ACH6 82K800H9AR ThinkBook 16p G2 ACH 20YM0048SP ThinkBook 16p G3 ARH 21EK000PUK ThinkBook 16p G2 ACH 20YM002TDT Legion S7 15ACH6 82K800AQIN Legion Slim 7 15ACH6 82K8009LSB ThinkBook 16p G3 ARH 21EK000EFR ThinkBook 16p G2 ACH 20YM001SCY Legion Slim 7 15ACH6 82K80013RK ThinkBook 16p G2 ACH 20YM000LAX Legion Slim 7 15ACH6 82K800EJMB ThinkBook 16p G2 ACH 20YM003EPS ThinkBook 16p G2 ACH 20YM0009UK Legion S7 15ACH6 82K80054LT ThinkBook 16p G2 ACH 20YM002WKG ThinkBook 16p G3 ARH 21EK0009KR ThinkBook 16p G2 ACH 20YM004MCK ThinkBook 16p G3 ARH 21EK000QGM ThinkBook 16p G2 ACH 20YM002TMZ Legion S7 15ACH6 82K800B9RU Legion Slim 7 15ACH6 82K8008WMZ ThinkBook 16p G3 ARH 21EK000EPE ThinkBook 16p G2 ACH 20YM001SMX Legion Slim 7 15ACH6 82K8002JIN ThinkBook 16p G2 ACH 20YM000MPK Legion Slim 7 15ACH6 82K800F1UK ThinkBook 16p G2 ACH 20YM003FCK ThinkBook 16p G2 ACH 20YM000AHV Legion S7 15ACH6 82K8005NAX ThinkBook 16p G2 ACH 20YM002WSP ThinkBook 16p G3 ARH 21EK000AHV ThinkBook 16p G2 ACH 20YM0056GJ ThinkBook 16p G3 ARH 21EK000QPK ThinkBook 16p G2 ACH 20YM002UAD Legion S7 15ACH6 82K800C3MJ Legion Slim 7 15ACH6 82K8005JLM ThinkBook 16p G3 ARH 21EK000HJP ThinkBook 16p G2 ACH 20YM001TFR Legion Slim 7 15ACH6 82K8002PGM Legion Slim 7 15ACH6 82K800GAMH ThinkBook 16p G2 ACH 20YM003FLT ThinkBook 16p G2 ACH 20YM000ARA Legion Slim 7 15ACH6 82K8009PMJ Legion S7 15ACH6 82K80065PB ThinkBook 16p G2 ACH 20YM002YAD ThinkBook 16p G3 ARH 21EK000APS Legion S7 15ACH6 82K8000EFR Legion S7 15ACH6 82K800D1TA ThinkBook 16p G3 ARH 21EK000MFR ThinkBook 16p G2 ACH 20YM001TRM Legion Slim 7 15ACH6 82K8005ASB Legion Slim 7 15ACH6 82K800GSSB ThinkBook 16p G2 ACH 20YM000VJP ThinkBook 16p G3 ARH 21EK0013FT ThinkBook 16p G2 ACH 20YM003FUA ThinkBook 16p G2 ACH 20YM000BDU Legion Slim 7 15ACH6 82K800A6SB Legion S7 15ACH6 82K8006TBM ThinkBook 16p G2 ACH 20YM003BJP ThinkBook 16p G2 ACH 20YM000AGE Legion S7 15ACH6 82K80015BR Legion S7 15ACH6 82K800DHKR ThinkBook 16p G3 ARH 21EK000MPE ThinkBook 16p G2 ACH 20YM001WHV Legion S7 15ACH6 82K80071SA Legion Slim 7 15ACH6 82K80042HH ThinkBook 16p G3 ARH 21EK000BFR Legion Slim 7 15ACH6 82K800H9AR ThinkBook 16p G2 ACH 20YM0019CY ThinkBook 16p G3 ARH 21EK001MPH ThinkBook 16p G2 ACH 20YM000BML Legion Slim 7 15ACH6 82K800APSB ThinkBook 16p G2 ACH 20YM003CHV ThinkBook 16p G2 ACH 20YM000ACK Legion S7 15ACH6 82K8001MUS ThinkBook 16p G2 ACH 20YM002UBM Legion S7 15ACH6 82K800E2HH ThinkBook 16p G2 ACH 20YM0045AU ThinkBook 16p G3 ARH 21EK000NAT ThinkBook 16p G2 ACH 20YM001XCY Legion S7 15ACH6 82K8007HRK Legion Slim 7 15ACH6 82K8001QAU ThinkBook 16p G3 ARH 21EK000BPE ThinkBook 16p G2 ACH 20YM0019LT ThinkBook 16p G3 ARH 21EK0025US ThinkBook 16p G2 ACH 20YM000BYA Legion Slim 7 15ACH6 82K800B8RU ThinkBook 16p G2 ACH 20YM003CRA ThinkBook 16p G2 ACH 20YM0008AK Legion S7 15ACH6 82K80026RM ThinkBook 16p G2 ACH 20YM002UKG Legion S7 15ACH6 82K800EJMB ThinkBook 16p G2 ACH 20YM0047GM ThinkBook 16p G3 ARH 21EK000NIW ThinkBook 16p G2 ACH 20YM001XMX Legion S7 15ACH6 82K80081US Legion Slim 7 15ACH6 82K8006HAX ThinkBook 16p G3 ARH 21EK000CAT ThinkBook 16p G2 ACH 20YM0019SP ThinkBook 16p G3 ARH 21EK002RVN ThinkBook 16p G2 ACH 20YM000EFE Legion Slim 7 15ACH6 82K800C1TW ThinkBook 16p G2 ACH 20YM003DCY ThinkBook 16p G2 ACH 20YM0008IV Legion S7 15ACH6 82K8002QGM ThinkBook 16p G2 ACH 20YM002USP Legion S7 15ACH6 82K800F1UK ThinkBook 16p G2 ACH 20YM0047PK ThinkBook 16p G3 ARH 21EK000NRU ThinkBook 16p G2 ACH 20YM0023FG Legion S7 15ACH6 82K80098VN Legion Slim 7 15ACH6 82K80060PB ThinkBook 16p G3 ARH 21EK000CIW ThinkBook 16p G2 ACH 20YM001AFE Legion Slim 7 15ACH6 82K80019RU ThinkBook 16p G2 ACH 20YM000BBM Legion Slim 7 15ACH6 82K80056UK ThinkBook 16p G2 ACH 20YM001SPB ThinkBook 16p G2 ACH 20YM001TCK Legion Slim 7 15ACH6 82K8001MUS ThinkBook 16p G2 ACH 20YM002VGE Legion Slim 7 15ACH6 82K800DPVN ThinkBook 16p G2 ACH 20YM000AMX ThinkBook 16p G2 ACH 20YM001XCK Legion Slim 7 15ACH6 ThinkBook 16p G2 ACH 20YM003LVN Legion Slim 7 15ACH6 82K8001GRU ThinkBook 16p G2 ACH 20YM0048MB ThinkBook 16P G2 ACH 20YM001JTX ThinkBook 16p G2 20YM0009GE ThinkBook 16p G2 ACH 20YM003EMZ Legion Slim 7 15ACH6 82K80020MH ThinkBook 16p G2 ACH 20YM001AMH Thinkbook 16P G2 ACH 20YM003JVN ThinkBook 16p ThinkBook 16p G2 ACH 20YM0008RU Legion Slim 7 15ACH6 82K80001US ThinkBook 16p G2 ACH 20YM000ASP Legion Slim 7 15ACH6-82K8005MTA Legion Slim 7 15ACH6 82K80002US ThinkBook 16p G2 ACH 20YM0008CK Legion Slim 7 15ACH6 82K80007PH Legion S7 15ACH6 82K80030GE ThinkBook 16p G2 ACH 20YM002UUK ThinkBook 16p G2 ACH 20YM002TGE ThinkBook 16p G2 ACH Thinkbook 16P G2 ACH 20YM003MVN Legion Slim 7 15ACH6 82K8000FFR ThinkBook 16p G2 ACH 20YM000BUK ThinkBook 16p G2 ACH 20YM000ARU ThinkBook 16p G2 20YM000BGE ThinkBook 16p G2 ACH 20YM0009FR

Replaces Part Numbers

5B11C04256 5B11C04261 L20L4PD3 L20M4PD3 SB11C04260 SB11C04262

Technical Specifications

Voltage15.36V
Amp Hours4550mAh
Capacity4550mAh
Rate69.89Wh
Net Weight268g /9.45 oz
Gross Weight528g /18.62 oz
Approximate Weight528g /18.62 oz
Dimension 292.00 x 91.70 x 5.80mm

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 16p shows the new battery as "0% available (plugged in, not charging)" right after I installed it — what's happening?

The BMS on these ThinkBook cells needs to complete a handshake before the charge controller opens the charge path. Power off completely, remove the AC adapter for 30 seconds, reconnect AC, then power on — this forces a fresh BMS negotiation. If the cell still shows 0%, the BIOS charge controller is holding a fault state from the previous battery; go to Vantage app → Power → Battery and toggle Conservation Mode off, then back on to reset it. Charge should begin within 60 seconds of that toggle.

The Lenovo Vantage app is reporting this replacement battery as 61Wh — the product says 69.89Wh. Is the cell wrong?

The Wh figure displayed in Vantage pulls from the EEPROM "design capacity" field written at the factory, which sometimes reflects a conservative rated value rather than the actual measured cell capacity. The physical chemistry and voltage are correct — 15.36V, four-cell Li-Polymer. After one full discharge-to-hibernate and a full recharge, Vantage recalculates from live coulomb-counting data and the reported figure typically moves closer to the actual 69.89Wh.

After fitting the replacement, my ThinkBook 16p won't charge past 80% — is the battery defective?

This is a BIOS-controlled charge limit, not a cell fault. Lenovo's firmware includes a Conservation Mode that caps charge at 80% to reduce long-term cell stress — it is sometimes active by default after a battery swap. Open the Vantage app, navigate to Power → Battery Charge Threshold, and confirm Conservation Mode is off. Once disabled, the charge limit lifts and the cell will accept charge to 100%.

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Lenovo ThinkBook 16p G3 ARH 21EK000CRU Replacement Battery, 15.36V, 4550mAh, Li-Polymer 1

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