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Rectangular black lithium-ion laptop battery with label showing 46Wh 14.8V

Beisite

Beisite 45N1138-1141 46Wh 14.8V laptop battery for ThinkPad S3 S431 S440 V4400u

SKU CH-TBBB-K0W83

46 Wh, 14.8 V lithium-ion replacement battery for ThinkPad S3, S431, S440 and V4400u models

  • ColorBlack
  • TypeBattery
  • Battery TypeLithium-Ion
  • 46Wh capacity supports longer unplugged sessions
  • 8V lithium-ion chemistry matches original power specifications
  • Replaces part numbers 45N1138 45N1139 45N1140 45N1141 for direct fit
  • Compatible with ThinkPad S3 S431 S440 V4400u series laptops
  • Brand-new condition ensures full rated cycle life from first use

Direct replacement battery

The Beisite 45N1138-1141 is a 46Wh lithium-ion pack built for Lenovo ThinkPad S3, S431, S440 and V4400u series notebooks. It matches the original 14.8V specification and replaces part numbers 45N1138, 45N1139, 45N1140, 45N1141, LC P/N 121500158 and 121500159. Owners of those models can swap the old cell without adapter changes.

Voltage and form-factor limits

The pack delivers a fixed 14.8V output, so it only suits laptops designed for that exact voltage. Physical dimensions follow the ThinkPad S3, S431, S440 and V4400u battery bay; systems outside that family will not accept the connector or mounting points. No circuitry adapts the voltage for other platforms.

46Wh capacity envelope

At 46Wh the cell restores the factory runtime those ultraportables shipped with, covering typical office workloads and media playback on a single charge. Heavy multi-core tasks or sustained high brightness will drain it faster, and the pack cannot exceed its rated watt-hour ceiling. Users needing all-day autonomy away from mains power should plan for a recharge or a second unit.

Highlights

  • 46Wh capacity supports longer unplugged sessions
  • 8V lithium-ion chemistry matches original power specifications
  • Replaces part numbers 45N1138 45N1139 45N1140 45N1141 for direct fit
  • Compatible with ThinkPad S3 S431 S440 V4400u series laptops
  • Brand-new condition ensures full rated cycle life from first use

Specifications

Brand45N1138 45N1139 45N1140 45N1141
Model45N1138 45N1139 45N1140 45N1141
ColorBlack
TypeBattery
Battery TypeLithium-Ion

Questions about this item

Which part number — 45N1138, 45N1139, 45N1140 or 45N1141 — should I pick for my ThinkPad?

All four part numbers refer to the same 14.8 V, 46 Wh lithium-ion battery; choose the one that matches the label on your original pack.

What does the 46 Wh rating actually deliver in a ThinkPad S3, S431, S440 or V4400u?

It restores the original 46 watt-hour capacity, giving comparable run-time to the factory battery when new.

Does the 14.8 V output work with the ThinkPad S3, S431, S440 and V4400u charging circuit?

Yes — 14.8 V is the voltage specified for those models, so the battery charges and runs normally.

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