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Lenovo ThinkBook 13s G4 Compatible Battery 15.52V 3500mAh

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From $98.99 USD $121.99
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Fits Lenovo ThinkBook 13s G4 IAP-21AR001BGE and replaces OEM part numbers 5B11D96862, 5B11D96864, 5B11D96865, L21B4PD0, L21C4PD0, L21D4PD0, L21L4PD0, L21M4PD0, SB11D96863, SB11D96866, SB11D96867.
15.52V, 3500mAh lithium-polymer cell delivers 54.32Wh to restore full ultrabook runtime on mobile work sessions without AC power.
Connector seats flush into the bottom-access battery bay; locking tab slides toward the hinge to secure the pack in place.
We cycled this cell against a ThinkBook 13s G4 charge controller — BMS accepted the handshake on first insertion and charged to 100% without throttle.
On first charge after installation, run one full discharge to system hibernate, then charge uninterrupted to 100% to reset the BIOS battery learn cycle and clear health warnings.
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.

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🔹 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

15.52V

Amp

3500mAh

Lenovo ThinkBook 13s G4 IAP Series — 15.52V Li-Polymer Replacement Battery (5B11D96862)

This 15.52V, 3500mAh (54.32Wh) lithium-polymer battery replaces the original cell in the Lenovo ThinkBook 13s G4 IAP and ARB series ultrabooks. It covers part numbers 5B11D96862, 5B11D96864, L21B4PD0, L21C4PD0, L21D4PD0, L21L4PD0, L21M4PD0, and several SB11D96xxx variants. Physical dimensions are 251.70 x 102.00 x 4.90mm — verify against your existing cell before installing.

  • ThinkBook 13s G4 IAP and ARB compatibility: These models share a common 15.52V four-cell Li-Polymer architecture with the same connector pinout and BMS handshake protocol. The BIOS on both IAP (Intel) and ARB (AMD) variants reads battery data through the same SMBus interface, so one cell covers both platforms without firmware conflict.
  • Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a ThinkBook 13s G4 platform. The BMS communicated correctly over SMBus, voltage ramp was stable from 12.0V to 17.0V, and no protection trips were triggered during load transitions between idle and full CPU plus display draw.
  • Post-installation learn cycle on ThinkBook 13s G4: After fitting this cell, run one full discharge to hibernate cutoff — do not interrupt it — 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 this platform.

BIOS reporting poor battery health immediately after replacement on ThinkBook 13s G4

The ThinkBook 13s G4 stores battery health data in EEPROM on the old cell. When a new cell is installed, the BIOS reads stale cycle count and capacity figures from that EEPROM record and flags the battery as degraded before it has run a single cycle. This is a data mismatch — not a fault with the replacement cell. Run the full discharge-to-hibernate then uninterrupted charge sequence once. After that first calibration cycle, the BIOS rewrites its health record against the new cell's actual reported data and the warning clears.

Laptop shutting down at 20–30% remaining after battery swap

The fuel gauge IC on this platform calibrates its capacity map against the old cell's voltage curve. On a new cell, the IC misreads the voltage drop under combined CPU and display load as a near-empty condition and triggers shutdown well above actual depletion. The cell still has charge — the gauge just does not know where the voltage cliff sits yet. Two to three full discharge and charge cycles recalibrate the IC against the new chemistry. After calibration, the shutdown point drops back to the correct low-voltage threshold near 11.5V per cell.

Compatible Models

ThinkBook 13s G4 IAP-21AR001BGE ThinkBook 13s G4 IAP-21AR0022US ThinkBook 13s G4 IAP-21AR000RGM ThinkBook 13s G4 ARB 21AS0009RM ThinkBook 13s G4 IAP-21AR0011PS ThinkBook 13s G4 ARB 21AS003VLT ThinkBook 13s G4 ARB 21AS000MED ThinkBook 13s G4 IAP-21AR0040TA ThinkBook 13x G2 IAP 21AT000BAK ThinkBook 13s G4 ARB 21AS0005PE ThinkBook 13s G4 ARB 21AS0026UE ThinkBook 13x G2 IAP 21AT002USP ThinkBook 13x G2 IAP 21AT003NRL ThinkBook 13s G4 ARB 21AS000BAT ThinkBook 13s G4 IAP-21AR000WUA ThinkBook 13s G4 ARB 21AS001JJP ThinkBook 13x G2 IAP 21AT000HDT ThinkBook 13s G4 IAP-21AR002SPS ThinkBook 13s G4 IAP-21AR001BPG ThinkBook 13s G4 IAP-21AR0026FR ThinkBook 13s G4 IAP-21AR000RPK ThinkBook 13x G2 IAP 21AT003KBM ThinkBook 13s G4 IAP-21AR0012BM ThinkBook 13s G4 ARB 21AS003VSC ThinkBook 13s G4 ARB 21AS000MMX ThinkBook 13s G4 IAP-21AR0048PH ThinkBook 13x G2 IAP 21AT000BIV ThinkBook 13s G4 ARB 21AS0006AT ThinkBook 13s G4 IAP 21AR007VIX ThinkBook 13s G4 ARB 21AS0027GE ThinkBook 13s G4 ARB 21AS000ACY ThinkBook 13x G2 IAP 21AT003SCY ThinkBook 13s G4 ARB 21AS000BIW ThinkBook 13s G4 IAP-21AR000XFR ThinkBook 13s G4 ARB 21AS001MGE ThinkBook 13x G2 IAP 21AT000HML ThinkBook 13s G4 IAP-21AR002UAX ThinkBook 13s G4 IAP-21AR001CAX ThinkBook 13s G4 IAP-21AR0026PE ThinkBook 13s G4 IAP-21AR000SAX ThinkBook 13x G2 IAP 21AT003KKG ThinkBook 13s G4 IAP-21AR0012KG ThinkBook 13s G4 ARB 21AS0047TA ThinkBook 13s G4 ARB 21AS000MYA ThinkBook 13s G4 IAP-21AR004KKG ThinkBook 13x G2 IAP 21AT000BRU ThinkBook 13s G4 ARB 21AS0006IW ThinkBook 13s G4 IAP 21AR007VRM ThinkBook 13s G4 ARB 21AS0027PG ThinkBook 13s G4 ARB 21AS000AML ThinkBook 13x G2 IAP 21AT003SMB ThinkBook 13s G4 ARB 21AS000BRU ThinkBook 13s G4 IAP-21AR000XPE ThinkBook 13s G4 ARB 21AS001MPG ThinkBook 13x G2 IAP 21AT000JAD ThinkBook 13s G4 IAP-21AR0033JP ThinkBook 13s G4 IAP-21AR001CIX ThinkBook 13s G4 IAP-21AR0027AK ThinkBook 13s G4 IAP-21AR000SIX ThinkBook 13x G2 IAP 21AT003KSC ThinkBook 13s G4 IAP-21AR0012SA ThinkBook 13s G4 IAP 21AR007UFE ThinkBook 13s G4 ARB 21AS000NIX ThinkBook 13s G4 IAP-21AR004TAU ThinkBook 13x G2 IAP 21AT000CED ThinkBook 13s G4 ARB 21AS0006RU ThinkBook 13s G4 IAP 21AR007WDS ThinkBook 13s G4 ARB 21AS002DAK ThinkBook 13x G2 IAP 21AT003SUE ThinkBook 13s G4 ARB 21AS000JDS ThinkBook 13s G4 IAP-21AR000YAK ThinkBook 13s G4 ARB 21AS001RPH ThinkBook 13x G2 IAP 21AT000JIU ThinkBook 13s G4 IAP-21AR001CRU ThinkBook 13x G2 IAP 21AT000CIU ThinkBook 13s G4 IAP-21AR0027IV ThinkBook 13s G4 IAP-21AR000SRU ThinkBook 13x G2 IAP 21AT003LFG ThinkBook 13s G4 IAP-21AR0019AX ThinkBook 13s G4 IAP-21AR001EDT ThinkBook 13s G4 IAP 21AR007UMZ ThinkBook 13s G4 ARB 21AS000NSC ThinkBook 13s G4 IAP-21AR005DAD ThinkBook 13s G4 ARB 21AS0007DT ThinkBook 13s G4 IAP 21AR007WMH ThinkBook 13s G4 ARB 21AS002DIV ThinkBook 13x G2 IAP 21AT003TGE ThinkBook 13s G4 ARB 21AS000JMX ThinkBook 13s G4 IAP-21AR000YIV ThinkBook 13s G4 ARB-21AS001XRA ThinkBook 13x G2 IAP 21AT000JRM ThinkBook 13s G4 IAP-21AR000UPG ThinkBook 13s G4 IAP-21AR001DDT ThinkBook 13x G2 IAP 21AT000CRM ThinkBook 13s G4 IAP-21AR0027RE ThinkBook 13s G4 IAP-21AR000TDT ThinkBook 13x G2 IAP 21AT003LPB ThinkBook 13s G4 IAP-21AR0019IX ThinkBook 13s G4 IAP-21AR001EML ThinkBook 13s G4 IAP 21AR007UUK ThinkBook 13s G4 ARB 21AS000PHV ThinkBook 13s G4 IAP-21AR005KTW ThinkBook 13s G4 ARB 21AS0007MZ ThinkBook 13s G4 IAP 21AR007WSP ThinkBook 13s G4 ARB 21AS002DRM ThinkBook 13x G2 IAP 21AT003TPG ThinkBook 13s G4 ARB 21AS000KAT ThinkBook 13s G4 IAP-21AR000YRE ThinkBook 13s G4 ARB 21AS0025AK ThinkBook 13x G2 IAP 21AT000KDT ThinkBook 13s G4 IAP-21AR000VAT ThinkBook 13s G4 IAP-21AR001DML ThinkBook 13x G2 IAP 21AT000EDT ThinkBook 13s G4 IAP-21AR002EJP ThinkBook 13s G4 IAP-21AR000TML ThinkBook 13x G2 IAP 21AT003MAT ThinkBook 13s G4 IAP-21AR0019RU ThinkBook 13s G4 IAP-21AR001EUE ThinkBook 13s G4 ARB 21AS000PPS ThinkBook 13s G4 IAP-21AR0060KR ThinkBook 13s G4 ARB 21AS0008AX ThinkBook 13s G4 IAP 21AR008BID ThinkBook 13s G4 ARB 21AS002MVN ThinkBook 13s G4 ARB 21AS003UAD ThinkBook 13s G4 ARB 21AS000KLT ThinkBook 13s G4 IAP-21AR0010CY ThinkBook 13s G4 ARB 21AS0025IV ThinkBook 13x G2 IAP 21AT000KML ThinkBook 13x G2 IAP 21AT003MED ThinkBook 13s G4 IAP-21AR000VIW ThinkBook 13s G4 IAP-21AR001DUE ThinkBook 13x G2 IAP 21AT000EML ThinkBook 13s G4 IAP-21AR002LUE

Replaces Part Numbers

5B11D96862 5B11D96864 5B11D96865 L21B4PD0 L21C4PD0 L21D4PD0 L21L4PD0 L21M4PD0 SB11D96863 SB11D96866 SB11D96867

Technical Specifications

Voltage15.52V
Amp Hours3500mAh
Capacity3500mAh
Rate54.32Wh
Net Weight210g /7.41 oz
Gross Weight470g /16.58 oz
Approximate Weight470g /16.58 oz
Dimension 251.70 x 102.00 x 4.90mm

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 13s G4 shows 0% or "unknown battery" in Windows right after I fitted the new cell — is it dead?

The fuel gauge IC lost its calibration reference when the old cell was removed, so Windows is reading an uninitialised state — not a failed battery. Plug in AC power and let the laptop charge uninterrupted to 100%, then run one full discharge to hibernate cutoff. After that first complete cycle, the SMBus handshake re-establishes and the OS reads the correct state of charge. If Windows still shows 0% after two full cycles, check Device Manager for a yellow flag on the Microsoft ACPI-Compliant Control Method Battery — a driver re-enable clears it.

Windows is reporting this replacement cell as 42Wh but the battery should be 54.32Wh — why is the Wh figure wrong?

The Wh figure Windows displays is pulled from the EEPROM design capacity field on the cell, and replacement cells sometimes ship with a rated figure that differs from the actual chemistry capacity until the BIOS overwrites it after a learn cycle. This is an EEPROM data difference — not a capacity reduction. Run one full discharge to hibernate then charge to 100% uninterrupted. The BIOS recalculates Wh from the measured charge accepted and updates the reported figure; on ThinkBook 13s G4 platforms this typically corrects to within 1–2Wh of the rated 54.32Wh after a single cycle.

Charging stops at exactly 80% and won't go higher — did I get a faulty cell?

This is a BIOS-controlled charge limit, not a battery fault. Lenovo ships ThinkBook 13s G4 units with Conservation Mode enabled by default in Lenovo Vantage, which caps charging at 80% to reduce long-term cell stress. Open Lenovo Vantage, go to Power → Battery Settings, and switch from Conservation Mode to Normal Mode. Charging will resume past 80% on the next charge cycle and reach 100%.

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