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Black rectangular lithium-ion laptop battery with connector strip

Beisite

Beisite B31N1336 48Wh 11.4V laptop battery

SKU CH-N97A-DXQET

Replacement lithium-ion battery rated 11.4V and 48Wh for compatible Vivobook models

  • Battery typeLithium-Ion
  • Battery voltage rating11.4 V
  • Battery capacity48 Wh
  • Product colorBlack
  • Product typeBattery
  • Compatible withFor Vivobook S551 S551LN S551 lb R553LF V551 V551L V551LA R5
  • Reliable power for Vivobook models with 48Wh lithium-ion capacity
  • Direct replacement for part numbers B31N1336, C31-S551, 31CP7/61/81
  • 4V output matches original battery voltage specification
  • 12-month warranty included for purchase confidence
  • Black lithium-ion cell fits S551, R553, K551 and V551 series laptops

Ready replacement for Vivobook series

This 48Wh lithium-ion cell matches the 11.4V specification used across the S551, S551LN, S551LB, R553LF, V551, V551L, V551LA, R553LN, K551L, K551LN and K551LA families. It replaces part numbers B31N1336, C31-S551 and 31CP7/61/81 in a single black module.

Drop-in fit with no extra hardware

The battery slots into the existing compartment without adapters, cables or firmware updates. It frees the notebook from mains dependency for a full charge cycle and restores mobile runtime on supported Vivobook models.

One battery in the pack

The box contains only the 48Wh unit itself; no tools, screws or software discs are bundled. Buyers needing a multi-cell upgrade or a higher-voltage alternative will not find those options here.

How it compares

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

Price $34.99
Pricier than about 62% of the 27,790 comparable items (median $30.99).

Specifications

Product
Brand nameB31N1336
Model nameB31N1336
Part number31CP7/61/81
Product colorBlack
Product typeBattery
Power
Battery typeLithium-Ion
Battery voltage rating11.4 V
Battery capacity48 Wh
Compatibility
Compatible withFor Vivobook S551 S551LN S551 lb R553LF V551 V551L V551LA R553LN K551L K551LN K551LA Series

Questions about this item

How long does the 48 Wh capacity last under continuous load before the voltage drops?

The 48 Wh lithium-ion pack is rated at 11.4 V; runtime under sustained load depends on the laptop's power draw, which varies by model and workload.

Does the battery run hot or make noise during all-day use?

The sealed lithium-ion cell produces no audible noise; heat output is determined by the host laptop's thermal design and charging circuit.

Which original part numbers must match for this battery to fit my Vivobook?

It replaces part numbers B31N1336, C31-S551 and 31CP7/61/81 and fits the listed Vivobook R533L, R553LF, R553LN, K551L, K551LA, K551LN, V551, V551L, S551, S551L and S551LN models.

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