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Rectangular black lithium-ion laptop battery with label showing model L21L4P73 and 57Wh capacity

KingSener

KingSener L21L4P73 57Wh laptop battery for ThinkPad T14s Gen 3 4

SKU CH-C2M7-3D5H8 MPN L21L4P73

57Wh lithium-ion replacement battery for ThinkPad T14s Gen 3 and Gen 4 models

  • Battery Voltage15.36V
  • Battery Capacity57Wh/3711MAH
  • 57Wh capacity supports long work sessions
  • 36V lithium-ion chemistry matches original spec
  • Replaces ten Lenovo part numbers including SB10W51975
  • Fits ThinkPad T14s Gen 3 and Gen 4 models
  • Brand-new replacement cell with one-year coverage

Replacement Battery for ThinkPad T14s Gen 3

This KingSener L21L4P73 battery is a direct replacement for Lenovo ThinkPad T14s Gen 3 (types 21BR, 21BS, 21CQ, 21CR) and Gen 4 (types 21F6, 21F7, 21F8, 21F9) laptops. It matches the original 57Wh capacity and 15.36V voltage using Li-ion cells. The unit is new and comes in black.

57Wh Capacity and 3711mAh Runtime Headroom

The 57Wh energy rating and 3711mAh charge capacity restore the laptop's original runtime for typical office workloads and mobile use. Heavy sustained loads such as continuous video rendering or high-brightness screen time will deplete the charge faster than light document work. The battery replaces part numbers including SB10W51975, 5B10W51874, and L21M4P75 among others.

Li-ion Cell Chemistry and Voltage Limits

Li-ion chemistry operates at a nominal 15.36V and requires the laptop's built-in charge controller to manage balancing and safety cut-offs. The pack does not support user-serviceable cells or external charging. It is not compatible with ThinkPad models outside the listed Gen 3 and Gen 4 T14s series or with systems requiring a different voltage or connector layout.

Highlights

  • 57Wh capacity supports long work sessions
  • 36V lithium-ion chemistry matches original spec
  • Replaces ten Lenovo part numbers including SB10W51975
  • Fits ThinkPad T14s Gen 3 and Gen 4 models
  • Brand-new replacement cell with one-year coverage

Specifications

BrandKingSener
ModelL21L4P73
Part NumberL21L4P73
SB10W51975
5B10W51874
4ICP5/68/70
L21M4P75
SB10W51976
5B10W51875
L21B4P71
SB10W51978
5B10W51877
L21D4P74
SB10W51977
5B10W51876
Battery Voltage15.36V
Battery Capacity57Wh/3711MAH

Questions about this item

Will the L21L4P73 57Wh battery fit the original chassis of my ThinkPad T14s Gen 3 without any modification?

Yes, the L21L4P73 is a direct replacement for part numbers SB10W51975 and 5B10W51874 and fits the ThinkPad T14s Gen 3 21BR 21BS 21CQ 21CR chassis exactly.

How can I confirm the new battery is reporting the correct 15.36V and 57Wh capacity in Lenovo Vantage after installation?

Open Lenovo Vantage, select Power, and verify the design capacity reads 57Wh and the voltage reads 15.36V; a full charge cycle will then calibrate the gauge.

Does the box include any screwdrivers or installation tools for the internal battery swap?

The package contains only the L21L4P73 57Wh Li-ion battery; you must supply a small Phillips screwdriver and any prying tools yourself.

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