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Black rectangular laptop battery with connector pins

GreenTechLLC

GreenTechLLC L21L4P73 57WHR 15.36V 4-cell laptop battery for Lenovo ThinkPad T14s Gen 3/4

SKU CH-WKN1-G695S

57 Whr 4-cell lithium-ion replacement battery for Lenovo ThinkPad T14s Gen 3 and Gen 4 models

  • Battery type4 Cell Lithium-Ion
  • Battery voltage rating15.36 V
  • Battery capacity3711 MAH
  • Product colorBlack
  • Product typeBattery
  • Compatible withLENOVO THINKPAD T14S GEN 3, T14S GEN 3 21BR, T14S GEN 3 21BS
  • Compatible with ThinkPad T14s Gen 3 and Gen 4 models
  • 57 Whr capacity provides extended runtime for mobile work
  • 4-cell lithium-ion design at 15.36 V matches original specifications
  • Replaces multiple OEM part numbers including L21B4P71 and L21M4P75
  • Tested for correct voltage, circuit protection and low self-discharge

GreenTech 57 Wh four-cell ThinkPad battery

This GreenTech four-cell lithium-ion pack delivers 57 Wh at 15.36 V for Lenovo ThinkPad T14s Gen 3 and Gen 4 models. It replaces the OEM part numbers L21B4P71, L21L4P73, L21M4P75 and the 5B10W51874-77 series. The unit suits owners who need a direct voltage and capacity match for daily mobile work.

Single-voltage 15.36 V design limits swapping

The battery operates at a fixed 15.36 V and 3711 mAh, so it cannot serve laptops that require a different cell voltage or a higher watt-hour rating. Users with ThinkPad models outside the listed Gen 3 and Gen 4 sub-models will find the connector and firmware handshake incompatible. It also does not support fast-charge protocols beyond the original specification.

Black polymer casing with internal protection

The black housing fits the existing battery bay without adapters or case modification. Built-in circuitry provides over-voltage, over-current and short-circuit safeguards while maintaining low self-discharge during storage. CE, FCC and RoHS certifications confirm compliance with basic safety and environmental standards for office and travel use.

How it compares

Measured against everything we stock in Laptop Chargers & Batteries, at today’s prices. Recalculated every night.

Price $59.99
Pricier than about 89% of the 27,790 comparable items (median $30.99).

Specifications

Product
Brand nameGreenTech
Model nameL21B4P71, L21L4P73, L21M4P75, SB10W51975, SB10W51976, SB10W51978, 5B10W51874, 5B10W51875, 5B10W51876, 5B10W51877
Part numberL21B4P71, L21L4P73, L21M4P75, SB10W51975, SB10W51976, SB10W51978, 5B10W51874, 5B10W51875, 5B10W51876, 5B10W51877
Product colorBlack
Product typeBattery
Power
Battery type4 Cell Lithium-Ion
Battery voltage rating15.36 V
Battery capacity3711 MAH
Compatibility
Compatible withLENOVO THINKPAD T14S GEN 3, T14S GEN 3 21BR, T14S GEN 3 21BS, T14S GEN 3 21CQ, T14S GEN 3 21CR, T14S GEN 4, T14S GEN 4 21F6, T14S GEN 4 21F7

Questions about this item

Which part number should I pick for my ThinkPad T14s Gen 3 or Gen 4?

All listed part numbers — L21B4P71, L21L4P73, L21M4P75, SB10W51975, SB10W51976, SB10W51978, 5B10W51874, 5B10W51875, 5B10W51876, 5B10W51877 — are direct replacements for the same 4-cell battery used across T14s Gen 3 and Gen 4 models.

What does the 57 Wh rating mean for daily runtime on a T14s?

The 57 Wh capacity at 15.36 V delivers 3711 mAh, matching the original factory specification so typical mixed workloads should see the same battery life the laptop had when new.

Does the 15.36 V connector match the original motherboard interface on the T14s?

Yes — the battery is built to the exact 15.36 V, 4-cell lithium-ion layout used by Lenovo for the T14s Gen 3 and Gen 4, so it plugs straight into the existing motherboard connector without adapters.

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