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Rectangular black laptop battery with four cells and label

PowerWarehouse

PowerWarehouse L21L4P71 laptop battery 15.44v 3400mah 4 cell

SKU CH-FS01-MK3Z9

A 15.44V 3400mAh four-cell lithium-ion replacement battery compatible with numerous ThinkPad P14s and T14 models

  • CompatibilityTHINKPAD P14S GEN 3 21J5, P14S GEN 4 21HG, T14 GEN 3 21AH, T
  • Battery Type4 Cell Lithium-Ion
  • Powers multiple ThinkPad P14s and T14 models
  • 44 V 3400 mAh capacity supports long work sessions
  • Four-cell lithium-ion design keeps weight low
  • Replaces a wide range of OEM part numbers
  • Brand-new condition ensures full rated performance

PowerWarehouse L21L4P71 4-cell replacement battery

The PowerWarehouse L21L4P71 is a 4-cell lithium-ion battery rated at 15.44v and 3400mah. It is built as a direct replacement for Lenovo ThinkPad P14s Gen 3 and Gen 4 as well as T14 Gen 3 and Gen 4 models. The unit ships new from a USA-based supplier and carries a 12-month warranty.

Replaces OEM part numbers L21L4P71 and SB10W51965

This battery covers a long list of OEM part numbers including 5B10W51865, 5B11M90025 and SB11M89826. The jump is worth it when the original pack no longer holds a useful charge or shows swelling. It restores factory voltage and capacity without requiring a higher-capacity chassis.

Suits owners of the listed ThinkPad models needing

Buyers with other laptop series or those seeking a higher-capacity 6-cell option should look elsewhere. The 4-cell form factor matches the original slim profile but cannot deliver the runtime of larger packs.

Highlights

  • Powers multiple ThinkPad P14s and T14 models
  • 44 V 3400 mAh capacity supports long work sessions
  • Four-cell lithium-ion design keeps weight low
  • Replaces a wide range of OEM part numbers
  • Brand-new condition ensures full rated performance

Specifications

Part NumberL21L4P71, SB10W51965, SB11M89826, 5B10W51865, 5B10W51900, 5B11M90025
CompatibilityTHINKPAD P14S GEN 3 21J5, P14S GEN 4 21HG, T14 GEN 3 21AH, T14 GEN 4, T14 GEN 4 21K4, 21HES06C2H, P14S GEN 3, P14S GEN 3 21J6, P14S GEN 4 21K5
Battery Type4 Cell Lithium-Ion

Questions about this item

Does the 4-cell 15.44 V 3400 mAh pack match the physical footprint of the original L21L4P71 battery in a ThinkPad P14s Gen 3?

Yes, the 4-cell lithium-ion unit is built to the same form factor as the OEM L21L4P71, SB10W51965 and 5B10W51865 batteries it replaces.

What is the common installation step that gets missed when swapping this battery in a T14 Gen 4?

After fitting the pack, connect the internal cable, then power on and let the BIOS recognise the new battery before loading the operating system.

How long does the 3400 mAh lithium-ion pack last before it needs replacing?

The manufacturer covers the battery with a 12-month warranty; typical lithium-ion packs of this capacity deliver several hundred charge cycles before runtime declines noticeably.

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