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Black rectangular lithium-ion laptop battery with label showing part numbers and 11.4V 44Wh rating

Beisite

Beisite 45N1740 45N1741 45N1742 45N1743 00NY639 11.4V 44Wh laptop battery

SKU CH-MPGB-WZ6FE

11.4V 44Wh lithium-ion replacement battery for ThinkPad T550, T550s, T560, W550 and W550s series laptops

  • Battery typeLithium-Ion
  • Battery voltage rating11.4 V
  • Battery capacity44 Wh
  • Product colorBlack
  • Product typeBattery
  • Compatible withFor ThinkPad T550 T550s T560 W550 W550s Series
  • Reliable power for ThinkPad T550, T560 and W550 series
  • 44 Wh capacity supports extended mobile work sessions
  • 4 V lithium-ion chemistry matches original specifications
  • Replaces part numbers 45N1740, 45N1741, 45N1742, 45N1743 and 00NY639
  • Brand-new condition with 12-month manufacturer warranty

Replacement Battery for ThinkPad T550 T560 W550

This lithium-ion replacement battery is built for Lenovo ThinkPad T550, T550s, T560, W550 and W550s models. It arrives new and ready to install, restoring mobile power without modification. Buyers needing a battery for other laptop families will not find a match here.

11.4V 44Wh Capacity Defines Fit

The pack delivers 11.4 volts and 44 watt-hours, matching the original specification for the listed ThinkPad series. Voltage and capacity together determine whether the battery will charge correctly and report accurate runtime. Systems expecting a different voltage or capacity will not work with this unit.

Single Battery Shipped From Interchangeable Part

The package contains one black battery; the supplier ships any of the cross-referenced part numbers such as 45N1740, 45N1741, 45N1742, 45N1743 or 00NY639 depending on stock. All listed variants are electrically compatible despite voltage differences noted by the supplier. No cables, tools or software are included.

How it compares

Measured against everything we stock in Laptop Chargers & Batteries, at today’s prices. Recalculated every night.

Price $33.99
Pricier than about 60% of the 27,790 comparable items (median $30.99).

Specifications

Product
Brand name45N1740 45N1741 45N1742 45N1743
Model name45N1740 45N1741 45N1742 45N1743
Part number3ICP7/62/66
Product colorBlack
Product typeBattery
Power
Battery typeLithium-Ion
Battery voltage rating11.4 V
Battery capacity44 Wh
Compatibility
Compatible withFor ThinkPad T550 T550s T560 W550 W550s Series

Questions about this item

How long will the 44Wh capacity run a ThinkPad T550 under typical office use?

The 44Wh rating matches the original battery specification, so runtime should be comparable to a new factory unit under the same workload and brightness settings.

Does the 11.4V rating work with every ThinkPad model listed even though the supplier ships any of the four part numbers?

Yes. The supplier notes that 45N1740, 45N1741, 45N1742 and 45N1743 are mutually compatible despite voltage differences, and the laptop's charging circuit handles the variation.

Will this battery fit the internal bay of a ThinkPad W550s without any adapter or modification?

It is a direct replacement for part numbers 45N1740, 45N1741, 45N1742, 45N1743 and 00NY639, so it seats in the standard battery compartment of all listed models.

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