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Black rectangular lithium-polymer laptop battery, 48Wh 11.4V

POWER-FENG

POWER-FENG 48Wh B31N1336 Battery for Asus Vivobook S551 R533L R553LF K551L

SKU CH-F24T-2A88V

A 48Wh 11.4V lithium-polymer replacement battery compatible with Asus Vivobook S551, R533L, R553LF and K551L series laptops

  • TypeBattery
  • Battery TypeLaptop Batteries
  • 48 Wh capacity extends runtime between charges
  • 4 V Li-polymer chemistry matches original spec
  • Replaces B31N1336 and C31-S551 part numbers
  • Fits Vivobook S551, R553 and K551 series models
  • Brand-new condition ensures full cycle life

Replacement Battery for Asus Vivobook S551 Series

The POWER-FENG 48Wh B31N1336 is a brand-new lithium-polymer battery designed to replace the original part in compatible Asus Vivobook laptops. It matches the 11.4V voltage and 4200mAh capacity of the factory unit. The black casing fits the S551, R553L, R553LF, K551L and related model families listed by the supplier. This unit restores mobile power for daily work or study away from a wall outlet.

Capacity and Voltage Match Determine Compatibility

The single specification that decides fit is the 48Wh capacity paired with 11.4V output, which must match the original battery label exactly. The part number B31N1336 and alternative code C31-S551 cross-reference to the models above; if your laptop requires a different watt-hour rating or voltage, this battery will not work. No other electrical or physical parameters override this match.

Suits Owners of Listed Vivobook Models Needing

This battery suits users who own one of the specific Asus Vivobook S551, R553, K551, V551 or A551 variants named in the compatibility list and need a new replacement. It is not for owners of other Asus series, ultrabooks requiring a different form factor, or buyers who want a higher-capacity extended-life pack.

Highlights

  • 48 Wh capacity extends runtime between charges
  • 4 V Li-polymer chemistry matches original spec
  • Replaces B31N1336 and C31-S551 part numbers
  • Fits Vivobook S551, R553 and K551 series models
  • Brand-new condition ensures full cycle life

Specifications

TypeBattery
Battery TypeLaptop Batteries

Questions about this item

How long will the 48Wh capacity run a typical Vivobook?

The 48Wh rating means the pack can deliver 48 watts for one hour; actual runtime depends on your model's power draw, screen brightness and workload, so a Vivobook S551 may last several hours on light tasks and less under heavy load

Does the 11.4V voltage match the original B31N1336 specification?

Yes, the replacement is rated at 11.4V, which matches the voltage of the original B31N1336 cell used in the listed Vivobook and K551 models

Will this battery fit the S551LB chassis without modification?

The pack is built to the B31N1336 form factor and is listed as compatible with the S551LB, S551LA, S551LN and other 551-series chassis, so it installs in the existing battery bay

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