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Rectangular black laptop battery with label showing 45N1743

PowerWarehouse

PowerWarehouse 45N1743 laptop battery ThinkPad T550 T550s T560 W550

SKU CH-K7PG-V0BBB

Replacement 11.4 V 3900 mAh lithium-ion battery for ThinkPad T550, T550s, T560, W550 and W550s models

  • Battery type4 Cell Lithium-Ion
  • Compatible with ThinkPad T550, T550s, T560, W550 series
  • Replaces OEM part numbers 45N1743 and 45N1742 directly
  • 4 V lithium-ion chemistry delivers reliable mobile power
  • 3900 mAh capacity supports extended work sessions away from outlets
  • Brand-new condition ensures full performance from first charge

Compatible replacement for ThinkPad T550 series

This PowerWarehouse 45N1743 battery fits Lenovo ThinkPad T550, T550s, T560, W550 and W550s models. It replaces OEM part numbers 45N1743 and 45N1742. The pack uses a three-cell lithium-ion design rated at 11.4V and 3900mAh. It is a new component supplied by a US-based company.

Steady discharge over a work session

The three-cell construction delivers a consistent 11.4V output during extended use rather than a brief peak. Capacity of 3900mAh supports typical office workloads across a full day without sudden voltage drops. Lithium-ion chemistry maintains stable performance as the charge depletes. No higher-capacity variant is offered in this listing.

Limited to specific ThinkPad chassis

This battery only fits the listed T550, T550s, T560, W550 and W550s models. It will not work in other ThinkPad series or non-Lenovo laptops. The 11.4V rating matches the original specification exactly. Buyers needing power for different machines must source a separate compatible pack.

How it compares

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

Price $51.99
Pricier than about 83% of the 27,790 comparable items (median $30.99).

Specifications

Product
Brand namePowerwarehouse
Power
Battery type4 Cell Lithium-Ion

Questions about this item

How much heat does the 11.4 V 3900 mAh pack generate during all-day use?

Lithium-ion cells run cool under normal load; the pack produces only slight warmth and no active cooling is required.

Does this 45N1743 replacement need any extra cable or adapter to fit my ThinkPad T550?

No. The battery mates directly to the internal connector used by OEM parts 45N1743 and 45N1742.

Will the 3-cell 11.4 V unit work correctly alongside the original 45 W charger I kept from my W550?

Yes. The voltage matches the system requirement, so the existing charger charges the pack normally.

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