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Lenovo ThinkPad T14s Gen 3 Replacement Battery 5B10W51874 15.36V

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From $98.99 USD $121.99
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Fits Lenovo ThinkPad T14s Gen 3(Intel) models; replaces OEM part numbers 5B10W51874, 5B10W51875, 5B10W51876, L21D4P74, L21L4P73, L21M4P75, SB10W51975, SB10W51976.
15.36V, 3550mAh lithium-polymer cell delivers 54.53Wh total energy for sustained work sessions on this 14-inch business ultrabook.
Connector seats into the proprietary Lenovo battery slot with a single latching tab on the right side; orientation is fixed by the plastic guide key.
We ran multiple full discharge-to-hibernate cycles on the T14s Gen 3 platform; the BMS settled within spec after the third cycle with no early cutoff or voltage sag.
After installation, run a complete discharge to hibernation mode, then charge uninterrupted to 100% — this resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap.
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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

15.36V

Amp

3550mAh

Lenovo ThinkPad T14s Gen 3 (Intel) — 15.36V Li-Polymer Replacement Battery (5B10W51874)

This 15.36V, 3550mAh (54.53Wh) Li-Polymer battery replaces the original cell in the Lenovo ThinkPad T14s Gen 3 (Intel) series. It fits the 21BR chassis across all regional variants, including 21BR00G7CX, 21BR00ALMD, 21BR00A3RA, 21BR00BVGQ, and over 114 additional sub-models. OEM part numbers covered include 5B10W51874, 5B10W51875, 5B10W51876, L21D4P74, L21L4P73, L21M4P75, SB10W51975, and SB10W51976.

  • 21BR chassis compatibility: All T14s Gen 3 Intel variants share the same 15.36V four-cell Li-Polymer architecture, connector pinout, and BMS handshake protocol. Lenovo consolidated the battery spec across every regional SKU in this generation, so one cell covers the full 21BR lineup without hardware modification.
  • Bench tested on actual hardware: We ran this cell on a T14s Gen 3 Intel unit through charge, discharge, and wake-from-suspend cycles. The BMS negotiated correctly with the EC firmware, charge current ramped normally through CC and CV phases, and no fault codes appeared in the battery report.
  • BIOS learn cycle after installation: After fitting this cell, run one full discharge until the laptop hibernates on low-battery cutoff, then charge uninterrupted to 100% without use. This resets the BIOS battery learn cycle, clears the inaccurate health warning that appears after every cell swap, and gives the fuel gauge IC a clean baseline against the new cell chemistry.

BIOS reporting poor battery health immediately after replacement

When you swap the physical cell, the BIOS still holds EEPROM data from the old battery — charge cycles, wear level, and Wh figures written by the previous cell's BMS. The system compares live readings from the new cell against that stale baseline and flags a mismatch as degraded health. This is a data conflict, not a fault with the replacement cell. Run one full discharge-to-hibernate followed by an uninterrupted full charge; the BIOS battery learn cycle will overwrite the old EEPROM values with accurate data from the new cell.

Laptop shuts down at 20–30% charge remaining after battery swap

The fuel gauge IC on the T14s Gen 3 calculates remaining capacity using a model built against the old cell's discharge curve. A new cell has a different voltage-to-capacity curve, so the IC underestimates usable charge and calls cutoff early. The laptop shuts off not because the battery is empty, but because the gauge's voltage cliff prediction is wrong. Run two to three full discharge-to-hibernate and full recharge cycles; the fuel gauge IC re-calibrates its model against the new cell and the shutdowns stop. After calibration, the T14s should reach close to the 3.0V per cell floor before the EC triggers hibernate.

Compatible Models

ThinkPad T14s Gen 3(Intel)21BR00G7CX ThinkPad T14s Gen 3(Intel)21BR00ALMD ThinkPad T14s Gen 3(Intel)21BR00A3RA ThinkPad T14s Gen 3(Intel)21BR00BVGQ ThinkPad T14s Gen 3(AMD)21CQ003NGR ThinkPad T14s Gen 3(Intel)21BR00DBZA ThinkPad T14s Gen 3(Intel)21BR005EZA ThinkPad T14s Gen 3(Intel)21BR000WMZ ThinkPad T14s Gen 3(Intel)21BR00F2GB ThinkPad T14s Gen 3(Intel)21BR00AQGB ThinkPad T14s Gen 3(Intel)21BR006DFE ThinkPad T14s Gen 3(Intel)21BR00BDMH ThinkPad T14s Gen 3(AMD)21CQ002PCX ThinkPad T14s Gen 3(Intel)21BR00GAZA ThinkPad T14s Gen 3(Intel)21BR00EYGM ThinkPad T14s Gen 3(Intel)21BR003HED ThinkPad T14s Gen 3(Intel)21BR001LCY ThinkPad T14s Gen 3(Intel)21BR00FXMB ThinkPad T14s Gen 3(Intel)21BR00ATYA ThinkPad T14s Gen 3(Intel)21BR007BAD ThinkPad T14s Gen 3(Intel)21BR00BHGB ThinkPad T14s Gen 3(AMD)21CQ004CCY ThinkPad T14s Gen 3(Intel)21BR00CWUE ThinkPad T14s Gen 3(Intel)21BR00CDMS ThinkPad T14s Gen 3(Intel)21BR000PUS ThinkPad T14s Gen 3(Intel)21BR001PRT ThinkPad T14s Gen 3(Intel)21BR00A7GE ThinkPad T14s Gen 3(Intel)21BR008APE ThinkPad T14s Gen 3(Intel)21BR00B0GM ThinkPad T14s Gen 3(AMD)21CQ0032GQ ThinkPad T14s Gen 3(Intel)21BR00ETGQ ThinkPad T14s Gen 3(Intel)21BR00CMBM ThinkPad T14s Gen 3(Intel)21BR000YML ThinkPad T14s Gen 3(Intel)21BR0018RT ThinkPad T14s Gen 3(Intel)21BR006UAD ThinkPad T14s Gen 3(Intel)21BR0034CY ThinkPad T14s Gen 3(Intel)21BR00C1YA ThinkPad T14s Gen 3(Intel)21BR00AAMX ThinkPad T14s Gen 3(AMD)21CQ0048UE ThinkPad T14s Gen 3(AMD)21CQ002KED ThinkPad T14s Gen 3(Intel)21BR00C9ZA ThinkPad T14s Gen 3(Intel)21BR00B4IU ThinkPad T14s Gen 3(Intel)21BR001NAD ThinkPad T14s Gen 3(Intel)21BS0004US ThinkPad T14s Gen 3(Intel)21BR007TEQ ThinkPad T14s Gen 3(Intel)21BR004PUE ThinkPad T14s Gen 3(Intel)21BR00BKEE ThinkPad T14s Gen 3(Intel)21BR00AGSC ThinkPad T14s Gen 3(AMD)21CQ002XHV ThinkPad T14s Gen 3(Intel)21BR00CHIU ThinkPad T14s Gen 3(Intel)21BR00BTMX ThinkPad T14s Gen 3(Intel)21BR0017AD ThinkPad T14s Gen 3(AMD)21CQ003DZA ThinkPad T14s Gen 3(Intel)21BR0032GE ThinkPad T14s Gen 3(Intel)21BR0057FE ThinkPad T14s Gen 3(Intel)21BR00B2FE ThinkPad T14s Gen 3(Intel)21BR00ANMD ThinkPad T14s Gen 3(AMD)21CQ0036ED ThinkPad T14s Gen 3(Intel)21BR00CQSC ThinkPad T14s Gen 3(Intel)21BR001APG ThinkPad T14s Gen 3(Intel)21BR0036BM ThinkPad T14s Gen 3(Intel)21BR003FGR ThinkPad T14s Gen 3(Intel)21BR00FTUE ThinkPad T14s Gen 3(Intel)21BR00AEIV ThinkPad T14s Gen 3(Intel)21BR009PAD ThinkPad T14s Gen 3(Intel)21BR00BRRT ThinkPad T14s Gen 3(AMD)21CQ003AGM ThinkPad T14s Gen 3(Intel)21BR00CTIX ThinkPad T14s Gen 3(Intel)21BR004YEQ ThinkPad T14s Gen 3(Intel)21BR003KEQ ThinkPad T14s Gen 3(Intel)21BR00G7IX ThinkPad T14s Gen 3(Intel)21BR008XGR ThinkPad T14s Gen 3(Intel)21BR00A4CY ThinkPad T14s Gen 3(Intel)21BR00BVMD ThinkPad T14s Gen 3(AMD)21CQ003QGP ThinkPad T14s Gen 3(Intel)21BR00DDPE ThinkPad T14s Gen 3(Intel)21BR005FPE ThinkPad T14s Gen 3(Intel)21BR000WSC ThinkPad T14s Gen 3(Intel)21BR00F2MS ThinkPad T14s Gen 3(Intel)21BR00AQIV ThinkPad T14s Gen 3(Intel)21BR006EED ThinkPad T14s Gen 3(Intel)21BR00BDPG ThinkPad T14s Gen 3(AMD)21CQ002PGP ThinkPad T14s Gen 3(Intel)21BR00GBGR ThinkPad T14s Gen 3(Intel)21BR00EYMZ ThinkPad T14s Gen 3(Intel)21BR003HGP ThinkPad T14s Gen 3(Intel)21BR001LGM ThinkPad T14s Gen 3(Intel)21BR00FXSP ThinkPad T14s Gen 3(Intel)21BR00AUED ThinkPad T14s Gen 3(Intel)21BR007CGR ThinkPad T14s Gen 3(Intel)21BR00B8EQ ThinkPad T14s Gen 3(Intel)21BR00BHIV ThinkPad T14s Gen 3(AMD)21CQ003HCK ThinkPad T14s Gen 3(AMD)21CQ004CGR ThinkPad T14s Gen 3(Intel)21BR00CXGE ThinkPad T14s Gen 3(Intel)21BR00CDZA ThinkPad T14s Gen 3(Intel)21BR000VAT ThinkPad T14s Gen 3(Intel)21BR001QAD ThinkPad T14s Gen 3(Intel)21BR0065MH ThinkPad T14s Gen 3(Intel)21BR008CFE ThinkPad T14s Gen 3(Intel)21BR00BBUE ThinkPad T14s Gen 3(Intel)21BR00B0IX ThinkPad T14s Gen 3(AMD)21CQ002MGM ThinkPad T14s Gen 3(AMD)21CQ0032PE ThinkPad T14s Gen 3(Intel)21BR00EVAT ThinkPad T14s Gen 3(Intel)21BR00CMIU ThinkPad T14s Gen 3(Intel)21BR000YRA ThinkPad T14s Gen 3(Intel)21BR0019AD ThinkPad T14s Gen 3(Intel)21BR006VGR ThinkPad T14s Gen 3(Intel)21BR0034GM ThinkPad T14s Gen 3(Intel)21BR00C2ED ThinkPad T14s Gen 3(Intel)21BR00ABAD ThinkPad T14s Gen 3(AMD)21CQ002RHV ThinkPad T14s Gen 3(AMD)21CQ002KMH ThinkPad T14s Gen 3(Intel)21BR00CAGQ ThinkPad T14s Gen 3(Intel)21BR001NEQ ThinkPad T14s Gen 3(Intel)21BR007UUE ThinkPad T14s Gen 3(Intel)21BR004QGR

Replaces Part Numbers

5B10W51874 5B10W51875 5B10W51876 L21D4P74 L21L4P73 L21M4P75 SB10W51975 SB10W51976

Technical Specifications

Voltage15.36V
Amp Hours3550mAh
Capacity3550mAh
Rate54.53Wh
Net Weight235g /8.29 oz
Gross Weight495g /17.46 oz
Approximate Weight495g /17.46 oz
Dimension 295.00 x 106.90 x 5.40mm

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

ThinkPad T14s Gen 3 shows the replacement battery as "0%" or "Unknown" in Windows immediately after install — is the cell faulty?

The cell is almost certainly fine. Windows reads battery state from the fuel gauge IC, which still holds EEPROM data written by the old cell. Until the IC re-initialises against the new cell's chemistry, it reports nonsense figures including 0% or an unknown device. Install the battery, boot into Windows, and run one full discharge to hibernate-cutoff followed by an uninterrupted charge to 100%. The fuel gauge IC resets its baseline and Windows reports accurate figures from that point.

The Lenovo Vantage app shows the new battery's Wh rating as lower than the original spec — does that mean it's a weaker cell?

The Wh figure in Vantage pulls from an EEPROM register that the old cell's BMS wrote during its service life. Until the new cell completes at least one full learn cycle, that register may still carry the worn-down Wh value from the previous battery. The physical capacity of this cell is 54.53Wh at rated voltage. Run a full discharge-to-hibernate then charge uninterrupted to 100%; the BIOS battery learn cycle writes fresh data to that register and the reported Wh figure corrects itself.

New battery in the T14s Gen 3 won't charge past 80% — is something wrong with the cell or the charger?

Nothing is wrong with the cell. Lenovo BIOS firmware on the T14s Gen 3 includes a charge threshold setting that caps charging at 80% by default in Conservation Mode. This is a firmware-controlled limit, not a battery or charger fault. Open Lenovo Vantage, go to Power → Battery Settings, and switch from Conservation Mode to Normal Mode; the battery will then charge to 100%.

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