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Rectangular black lithium-ion laptop battery, 57Wh 15.36V

Beisite

Beisite 57Wh 15.36V laptop battery for ThinkPad T14s Gen 3/4

SKU CH-QEJ6-SZXZT

57 Wh lithium-ion battery at 15.36 V replaces multiple part numbers for ThinkPad T14s Gen 3 and Gen 4

  • ColorBlack
  • TypeBattery
  • CompatibilityFor ThinkPad T14s Gen 3 Gen 4
  • Battery TypeLithium-Ion
  • Battery Voltage15.36V
  • Battery Capacity57Wh
  • 57Wh capacity powers ThinkPad T14s Gen 3 and Gen 4
  • 36V lithium-ion cell matches original voltage specification
  • Replaces L21B4P71 L21M4P75 L21C4P73 L21L4P73 L21D4P74 part numbers
  • Compatible with 21BR 21BS 21CQ 21CR 21F6 21F7 21F8 21F9 type codes
  • Brand new black battery supplied as single unit

Replacement battery for ThinkPad T14s Gen 3 and 4

This 57Wh lithium-ion pack operates at 15.36V and replaces Lenovo part numbers L21B4P71, L21M4P75, L21C4P73, L21L4P73 and L21D4P74. It is built for owners of ThinkPad T14s Gen 3 (types 21BR, 21BS, 21CQ, 21CR) and Gen 4 (types 21F6, 21F7, 21F8, 21F9) who need a new internal power source.

Fits inside the existing battery bay without

The unit slides into the standard compartment and connects to the motherboard using the original cable, so no extra brackets, cables or firmware tools are required. It restores mobile operation for machines that currently run only on AC power. Buyers whose laptop uses a different battery form factor or voltage cannot use this pack.

Lithium-ion chemistry runs cool and silent

The battery produces no fan noise and adds negligible heat during normal charge and discharge cycles. Power draw follows the laptop's own management system, so thermal behaviour matches the original component. No separate cooling or power-supply changes are needed.

Highlights

  • 57Wh capacity powers ThinkPad T14s Gen 3 and Gen 4
  • 36V lithium-ion cell matches original voltage specification
  • Replaces L21B4P71 L21M4P75 L21C4P73 L21L4P73 L21D4P74 part numbers
  • Compatible with 21BR 21BS 21CQ 21CR 21F6 21F7 21F8 21F9 type codes
  • Brand new black battery supplied as single unit

Specifications

BrandL21M4P75 L21L4P73 L21B4P71 L21D4P74
ModelL21M4P75 L21L4P73 L21B4P71 L21D4P74
Part Number5B11M90033
ColorBlack
TypeBattery
CompatibilityFor ThinkPad T14s Gen 3 Gen 4
Battery TypeLithium-Ion
Battery Voltage15.36V
Battery Capacity57Wh

Questions about this item

How long will the 57 Wh capacity last before the battery needs recharging during a full workday?

The 57 Wh rating stores enough energy for a typical office workload on ThinkPad T14s Gen 3 and Gen 4 models; actual runtime depends on screen brightness, CPU load and connected peripherals.

Does the 15.36 V lithium-ion pack run hot or make fan noise when the laptop is under continuous load?

The battery itself has no moving parts and generates minimal heat; any warmth or fan activity comes from the laptop’s own thermal management during sustained use.

Which original Lenovo part numbers must match for this replacement to fit my ThinkPad T14s?

It replaces Lenovo part numbers L21B4P71, L21M4P75, L21C4P73, L21L4P73, L21D4P74 and the 5B11M90033 series; verify your original battery label against this list before fitting.

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