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Rectangular black lithium-ion laptop battery pack

Beisite

Beisite B31N1402 48Wh 11.4V laptop battery

SKU CH-VDDE-21PM6

48 Wh lithium-ion replacement battery at 11.4 V for Asus N591LB, Q551 and Q552 series laptops

  • ColorBlack
  • TypeBattery
  • Compatibilityfor N591LB Q551 Q551L Q551LN Q552U Q552UB Series
  • Battery TypeLithium-Ion
  • Battery Voltage11.4V
  • Battery Capacity48Wh
  • Ready-to-install power for compatible Asus models
  • 48 Wh capacity keeps the laptop running longer
  • 4 V lithium-ion cell matches original specs
  • Replaces multiple OEM part numbers including B31N1402
  • Brand-new unit with 12-month supplier warranty

Replacement battery for Asus Q551 and N591 series

This new lithium-ion pack replaces part numbers B31N1402, B31BN9H, 0B200-01050000, 0B200-01050000M and 31CP7/61/81. It fits Asus models including N591LB, N591LB-1A, Q552UB, N592UB, N592UB-1A, Q551, Q551L, Q551LN, Q551LN-BBI7T09, Q551LN-BBI706, Q551LN-BSI708 and Q551LN-BSI709. The black casing matches the original appearance. Buyers whose laptop uses a different part number should verify compatibility before ordering.

48 Wh capacity at 11.4 V

The battery stores 48 Wh of energy at a nominal 11.4 V, matching the specification of the original Asus pack. This single figure determines whether the replacement will deliver the same runtime as the factory unit. If your original battery shows a different watt-hour rating or voltage, this model will not be a direct electrical match.

Steady discharge under sustained load

Lithium-ion chemistry maintains a stable voltage curve during extended use, so the pack supplies consistent power through long work sessions without the sharp drop-off seen in aged cells. The 48 Wh rating reflects usable energy across a full discharge cycle rather than a brief peak. Users who regularly run demanding applications for hours will see the same endurance profile as a new OEM battery.

Highlights

  • Ready-to-install power for compatible Asus models
  • 48 Wh capacity keeps the laptop running longer
  • 4 V lithium-ion cell matches original specs
  • Replaces multiple OEM part numbers including B31N1402
  • Brand-new unit with 12-month supplier warranty

Specifications

BrandB31N1402
ModelB31N1402
Part Number31CP7/61/81
ColorBlack
TypeBattery
Compatibilityfor N591LB Q551 Q551L Q551LN Q552U Q552UB Series
Battery TypeLithium-Ion
Battery Voltage11.4V
Battery Capacity48Wh

Questions about this item

How long will the 48Wh capacity run my Asus Q551LN in daily use?

The 48Wh rating means the battery stores 48 watt-hours of energy; actual runtime depends on your screen brightness, workload and power settings, but it matches the original specification for the Q551LN series.

What connector standard does the B31N1402 use to attach to the motherboard?

It uses the proprietary multi-pin connector designed for Asus N591LB, Q551, Q551L, Q551LN, Q552U and Q552UB models, keyed to the original B31N1402 pin-out.

Will this battery fit the battery bay of my Asus N592UB-1A without modification?

Yes, the black lithium-ion pack is shaped to the factory dimensions for the N592UB-1A and listed N591LB, Q551, Q551L, Q551LN and Q552UB series, so it seats directly in the existing bay.

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