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Rectangular black lithium-ion laptop battery, model B31N1402

POWER-FENG

POWER-FENG B31N1402 laptop battery for ASUS Q551 Q551L Q551LN

SKU CH-FK8S-901B6

Replacement lithium-ion battery delivering 48 Wh at 11.4 V for compatible ASUS Q551 series notebooks

  • Battery typeLithium-Ion
  • 4 V Li-ion chemistry delivers stable power for ASUS Q551 series
  • 48 Wh capacity supports extended work sessions away from mains
  • Direct replacement for part numbers B31N1402 and B31Bn9H
  • Compatible with ASUS N591LB Q551LN Q551 Q551L models
  • 100 % brand-new cells backed by two-year protection

Direct replacement for ASUS Q551 series

The POWER-FENG B31N1402 is a lithium-ion battery built to fit ASUS Q551, Q551L and Q551LN notebooks including the Q551LN-BBI706 and Q551LN-BSI708 sub-models. It restores mobile power for owners of those machines without requiring a different form factor.

Steady output through a full work session

Rated at 11.4 V and 48 Wh, the cell chemistry delivers consistent voltage as the charge declines rather than a sharp drop near empty. That behaviour supports sustained workloads such as document editing or video playback across the whole discharge cycle.

Black housing matches the original chassis

The replacement unit ships in a black finish that aligns with the stock battery colour on the supported ASUS models. Buyers needing a higher capacity than 48 Wh or a different voltage will not be served by this part.

How it compares

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

Price $36.99
Pricier than about 66% of the 27,790 comparable items (median $30.99).

Specifications

Power
Battery typeLithium-Ion

Questions about this item

How much heat does the 48Wh lithium-ion cell produce during all-day use?

The 48Wh lithium-ion cell runs at normal laptop-battery temperatures and does not add noticeable heat beyond the original pack.

Does the B31N1402 require any proprietary connector or cable that is not already inside the ASUS Q551?

No, the battery uses the standard internal connector found in the Q551 series so it fits without extra parts.

Will the 11.4V pack work correctly alongside the original charging circuit in an older Q551L?

Yes, the 11.4V rating matches the factory specification so the existing charger and firmware recognise it normally.

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