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Rectangular black lithium-ion battery pack with label showing model L20C4P71 57Wh 15.44V

ALSEYE

ALSEYE L20C4P71 57Wh 15.44V Li-ion Battery 2 in 1 accessory

SKU CH-WVHA-H8DQN MPN L20C4P71

A 57Wh 15.44V Li-ion replacement battery compatible with Lenovo ThinkPad X1 Carbon 9th and 10th Gen and X1 Yoga 6th and 7th Gen

  • 57Wh capacity powers extended work sessions
  • 44V Li-ion chemistry matches original specifications
  • Replaces multiple OEM part numbers including SB10T83217
  • Compatible with ThinkPad X1 Carbon 9th, 10th, 11th Gen and X1 Yoga 6th, 7th, 8th Gen
  • Brand-new unit with CE certification and protective packaging

What this battery replaces

This 57Wh lithium-ion unit replaces part numbers L20C4P71 L20M4P71 L20D4P71 L20L4P71 and SB10T83217 SB10T83216 SB10T83218 SB10T83215 in Lenovo ThinkPad X1 Carbon 9th 10th 11th Gen and X1 Yoga 6th 7th 8th Gen laptops. It is a brand-new component supplied with installation instructions. Buyers needing a different voltage or capacity should verify their original part number before ordering.

Thermal and power behaviour

The cell operates at 15.44V with a rated capacity of 57Wh 3695mAh and is CE certified for safety. In normal office use it delivers steady voltage without audible noise or active cooling. The pack is sealed and has no moving parts so thermal output remains low during typical charge and discharge cycles.

Sustained load characteristics

Under continuous workloads the lithium-ion chemistry maintains consistent output until the rated capacity is depleted. The 12-month replacement guarantee covers non-human-factor defects but does not extend to capacity loss from heavy daily cycling. Users who require longer runtimes between charges should consider a higher-capacity alternative if one exists for their specific model.

How it compares

Measured against everything we stock in 2-in-1 Device Accessories, at today’s prices. Recalculated every night.

Price $73.99
Pricier than about 63% of the 7,473 comparable items (median $56.99).

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Specifications

No published specifications for this item yet.

Questions about this item

How do I install the L20C4P71 battery in my ThinkPad X1 Carbon 10th Gen, and what step is often missed?

Power off the laptop, disconnect the AC adapter, remove the bottom case screws, detach the old battery connector, fit the new 15.44 V 57 Wh unit, reconnect the cable, and reattach the case — the step people skip is disconnecting the internal battery in BIOS first.

What maintenance or replacement will the L20C4P71 need over time?

As a Li-ion pack rated at 3695 mAh, it will gradually lose capacity; expect to replace it once runtime drops below your needs, typically after several hundred full charge cycles.

What limit appears first during sustained heavy use of the L20C4P71?

The 57 Wh capacity sets the runtime ceiling; under continuous high load the battery will deplete before any thermal or voltage limit is reached.

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