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Black rectangular lithium-polymer laptop battery with connector and screw holes

KingSener

KingSener T470 45N1742 3990mAh 44Wh 11.4V laptop battery

SKU CH-NR5N-WQPC5 MPN T470

A 44 Wh, 11.4 V lithium-polymer replacement battery with 3990 mAh capacity for compatible laptops

  • Battery voltage rating11.4 V
  • Battery capacity3,990 mAh/44WH
  • Replacement battery built to original dimensions for direct fit
  • 44 Wh capacity delivers extended runtime between charges
  • 4 V Li-polymer cells supply stable power output
  • Compatible with part numbers 45N1740 through 45N1743 and 00NY639
  • Brand-new condition with one-year warranty included

Direct Replacement Battery

The KingSener T470 45N1742 is a new lithium-polymer laptop battery built to match the original specifications for compatible Lenovo systems. It delivers a rated capacity of 3990mAh and 44Wh at 11.4V, restoring factory runtime for users whose original pack no longer holds a charge.

Drop-In Fit and Power

The pack shares the exact physical dimensions and connector layout of the original battery, so it installs without adapters or case modifications. It draws power from the laptop's standard charging circuit and requires no additional hardware, freeing the user from a tethered power adapter once installed.

Upgrade From Degraded Originals

This unit replaces worn or swollen OEM batteries identified by part numbers 45N1740, 45N1741, 45N1742, 45N1743 or 00NY639. The jump is worthwhile when the old pack drops below 80% of its design capacity or shows physical deformation. It is not for buyers needing a higher-capacity extended pack or a different voltage platform.

How it compares

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

Price $28.99
Typical for this category: the median of 27,790 items is $30.99.

Specifications

Product
Brand nameKingSener
Model name45N1742
Part number45N1740 45N1741 45N1742
45N1743 00NY639 SB10K12721
Power
Battery voltage rating11.4 V
Battery capacity3,990 mAh/44WH

Questions about this item

How long will the 44Wh capacity last under sustained use?

The 44Wh rating determines total energy available; actual runtime depends on the laptop's power draw under load.

Does the Li-polymer cell run hot or draw extra power during all-day operation?

Li-polymer cells operate efficiently; the battery itself adds no active cooling or power draw beyond the laptop's normal consumption.

Which original part numbers must my laptop already use for this replacement to fit?

Compatible with part numbers 45N1740, 45N1741, 45N1742, 45N1743 and 00NY639 SB10K12721.

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