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Rectangular black lithium-ion laptop battery, 42Wh 11.52V

Beisite

Beisite B31N1629 3ICP5/57/81 42Wh 11.52V laptop battery

SKU CH-7RFZ-KNJ10

42 Wh lithium-ion replacement battery at 11.52 V for compatible Asus E203 series laptops

  • Battery typeLithium-Ion
  • Battery voltage rating11.52 V
  • Battery capacity42 Wh
  • Product colorBlack
  • Product typeBattery
  • 42 Wh capacity keeps the laptop running longer
  • 52 V lithium-ion chemistry delivers stable power
  • Direct replacement for B31N1629 and 3ICP5/57/81 part numbers
  • Fits Asus E203, E203M, E203MA, E203MAH, E203N, E203NAH series
  • New genuine battery backed by 12 months warranty

Battery for Asus E203 series

The 42Wh lithium-ion cell replaces the original B31N1629 and 3ICP5/57/81 packs used in Asus E203, E203M, E203MA, E203MAH, E203N, E203NAH and FD080T models. It delivers 11.52V nominal voltage in a black housing and arrives as a single unit. Buyers whose laptop requires a different voltage, capacity or physical layout cannot use this part.

Sustained operation

The 42Wh rating defines the energy available during continuous use rather than a brief peak. Lithium-ion chemistry maintains a stable 11.52V output across the discharge cycle, so run-time degrades predictably instead of collapsing suddenly. No active cooling or external circuitry is included, so thermal behaviour depends entirely on the host chassis.

42Wh capacity decides fit

Capacity is the single figure that determines whether this battery meets the machine’s original run-time specification. A lower Wh value would shorten usable time; a higher one would not fit the bay or connector. Verify the original part number matches B31N1629 or 3ICP5/57/81 before ordering.

How it compares

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

Price $72.99
Pricier than about 90% of the 27,790 comparable items (median $30.99).

Specifications

Product
Brand nameB31N1629
Model nameB31N1629
Part number3ICP5/57/81
Product colorBlack
Product typeBattery
Power
Battery typeLithium-Ion
Battery voltage rating11.52 V
Battery capacity42 Wh

Questions about this item

Does the 11.52 V 42 Wh lithium-ion cell run hot during all-day use?

The pack is a standard 11.52 V 42 Wh lithium-ion unit; it produces no more heat than the original Asus battery it replaces.

Must I already own an Asus E203-series laptop for this B31N1629 pack to work?

Yes — it fits Asus E203, E203M, E203MA, E203MAH, E203N, E203NAH and FD080T models using part numbers B31N1629 or 3ICP5/57/81.

Will the 3ICP5/57/81 battery align with the original chassis screws on my older E203MAH?

The replacement matches the factory B31N1629 form factor, so the existing screw holes and connector line up without modification.

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