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Black rectangular lithium-polymer laptop battery with label showing 42Wh 11.1V

POWER-FENG

POWER-FENG 42Wh B31B1632 laptop battery

SKU CH-PDKA-ZZMDD

A 42 Wh, 11.1 V lithium-polymer replacement battery for Asus X405U, X405UA, X405UR, X405UQ, S4000U, S4100U and S4100UQ models

  • Battery typeLaptop Batteries
  • Product typeBattery
  • 42 Wh capacity powers longer sessions away from mains
  • 1 V output matches original Asus specification
  • Li-polymer chemistry keeps weight low and shape slim
  • Replaces part number B31N1632 for direct fit
  • Compatible with X405U, X405UA, X405UR, X405UQ series

Compatible Replacement Battery

The POWER-FENG 42Wh B31B1632 is a new lithium-polymer battery built to replace the original B31N1632 unit in select Asus laptops. It targets owners of X405U, X405UA, X405UR, X405UQ, A405U, S4000U, S4100U and S4100UQ models who need a direct swap. The black pack restores mobile power without adapter modifications.

42Wh Capacity and Runtime

Rated at 11.1V and 3727mAh, the 42Wh cell delivers enough energy for typical office tasks, web browsing and media playback on supported ultraportables. Heavy workloads such as sustained video encoding or gaming will deplete the charge faster, requiring a mains connection for extended sessions. The polymer chemistry holds voltage steadily through most of the discharge curve.

Drop-In Fit for Listed Chassis

The battery matches the mechanical footprint and connector of the factory part, so it slides into the existing bay without case alterations or cable rerouting. No additional drivers or BIOS updates are needed on the supported Asus models. Buyers with other laptop series or higher-capacity requirements should verify compatibility before ordering.

How it compares

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

Price $35.99
Pricier than about 64% of the 27,790 comparable items (median $30.99).

Specifications

Product
Product typeBattery
Power
Battery typeLaptop Batteries

Questions about this item

Will the 42Wh B31B1632 battery work with my Asus X405UA laptop?

Yes, the B31B1632 is listed as a direct replacement for the Asus X405UA, X405U, X405UQ, and X405UR models.

How can I verify the 11.1V battery is functioning correctly after installation?

The operating system should detect the 3727mAh capacity and report a full charge without calibration errors.

Does the package include the B31N1632 battery only, or are tools and screws supplied?

The box contains the replacement battery unit; installation tools and chassis screws are not included.

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