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Black rectangular lithium-ion laptop battery with label showing 42Wh 11.55V

Beisite

Beisite B31N1915 42Wh 11.55V laptop battery

SKU CH-5M58-Q3MYJ

42Wh 11.55V lithium-ion replacement battery for Asus EXPERTBook B1 and BR1100 series laptops

  • Battery typeLithium-Ion
  • Battery voltage rating11.55 V
  • Battery capacity42 Wh
  • Product colorBlack
  • Product typeBattery
  • Compatible withFor EXPERTBook B1 BR1100CKA BR1100FKA B1400CEAE B1500CEAE Se
  • 42Wh capacity powers Asus EXPERTBook B1 models through a full workday
  • 55V lithium-ion cell matches original voltage for stable performance
  • Replaces part numbers B31N1915, B200-03760000 and 31CP5/57/80
  • Fits BR1100CKA, BR1100FKA, B1400CEAE and B1500CEAE series laptops
  • Brand-new condition with 12-month supplier warranty included

What this battery replaces

The B31N1915 42Wh 11.55V lithium-ion unit replaces original part numbers B31N1915, B200-03760000 and 31CP5/57/80. It fits Asus EXPERTBook B1 BR1100CKA, BR1100FKA, B1400CEAE and B1500CEAE series laptops. The swap is worth it when the original pack no longer holds a full charge or shows swelling.

Installation and common issues

The pack ships as a single black battery with no cables or tools included. Most EXPERTBook B1 models use a bottom case secured by small screws; a Phillips #0 driver is usually sufficient. Take care not to pinch the ribbon cable when refitting the cover. Forcing the connector or overtightening screws are the typical causes of damage. This battery is not for users needing higher capacity than 42Wh or a different voltage.

Compatibility summary

Supported models include EXPERTBook B1 B1400CEAE-EB0548R, EK0254R, EK0254RA, EK1492, B1500CEAE, BQ0441R, BQ0637R, BQ2141, EJ0090, EJ0221R, BR1100CKA-GJ0272RA, BR1100FKA-BP0170RA, BP2092RA, plus L1 L1400CDA and L1500CDA variants.

How it compares

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

Price $43.99
Pricier than about 76% of the 27,790 comparable items (median $30.99).

Specifications

Product
Brand nameB31N1915
Model nameB31N1915
Part number31CP5/57/80
Product colorBlack
Product typeBattery
Power
Battery typeLithium-Ion
Battery voltage rating11.55 V
Battery capacity42 Wh
Compatibility
Compatible withFor EXPERTBook B1 BR1100CKA BR1100FKA B1400CEAE B1500CEAE Series

Questions about this item

Does the 11.55V 42Wh pack fit the EXPERTBook B1 B1400CEAE-EK0254R chassis without modification?

Yes, the B31N1915 is listed as a direct replacement for that exact model and shares the original voltage and capacity figures.

Which screws or clips must be released before sliding the B31N1915 into the BR1100FKA-BP0170RA?

Remove the bottom-case screws, disconnect the old battery cable, then insert the new pack and reconnect the cable before refitting the cover.

When should the 42Wh lithium-ion unit be swapped out for a fresh one?

Replace it once run-time drops noticeably below the original level or the battery no longer holds a full charge after a complete cycle.

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