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Black rectangular lithium-ion laptop battery with connector on one side

Beisite

Beisite C31N1815 50Wh 11.55V laptop battery

SKU CH-TZQQ-2517B

A 50 Wh lithium-ion replacement battery for Asus ZenBook 13 UX333 series laptops

  • Battery typeLithium-Ion
  • Battery voltage rating11.55 V
  • Battery capacity50 Wh
  • Product colorBlack
  • Product typeBattery
  • Compatible withFor Zenbook 13 UX333 UX333F UX333FN UX333FA UX333FA-A3070T U
  • 50Wh capacity supports extended mobile work sessions
  • 55V lithium-ion chemistry matches original power specifications
  • Direct replacement for Asus ZenBook 13 UX333 series laptops
  • Compatible with multiple part numbers including C31N1815 and 0B200-03150000
  • New condition ensures full rated capacity from first charge

Beisite C31N1815 50Wh replacement battery

This 11.55V lithium-ion pack is built for Asus ZenBook 13 UX333, UX333F, UX333FN and UX333FA series ultraportables. It matches the original C31N1815, C31PoJ5 and 0B200-03150000 part numbers. Owners of compatible ZenBook 13 models can restore factory runtime with a direct-fit unit.

50Wh capacity at 11.55V decides fit

The battery delivers 50 watt-hours at 11.55 volts, the exact energy rating Asus specifies for the listed ZenBook 13 chassis. A different voltage or capacity would prevent the firmware from recognising the pack or cause charging errors. Verify the 50Wh figure on your original battery before ordering.

No cables, tools or software included

The box contains only the black lithium-ion cell assembly wrapped in anti-static packaging. Installation requires opening the laptop base and disconnecting the old pack; no driver, calibration utility or mounting hardware is supplied. Buyers who want a toolkit or external charger must source those separately.

How it compares

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

Price $36.99
Pricier than about 66% of the 27,790 comparable items (median $30.99).

Specifications

Product
Brand nameC31N1815
Model nameC31N1815
Product colorBlack
Product typeBattery
Power
Battery typeLithium-Ion
Battery voltage rating11.55 V
Battery capacity50 Wh
Compatibility
Compatible withFor Zenbook 13 UX333 UX333F UX333FN UX333FA UX333FA-A3070T U3300FN RX333FN BX333FN

Questions about this item

How long will the 50Wh capacity actually run my ZenBook 13 UX333FN on a single charge?

A 50Wh lithium-ion pack typically delivers several hours of mixed office work on a ZenBook 13, though exact runtime depends on screen brightness, workload and battery health.

Does the 11.55V rating match the original Asus C31N1815 connector and charging circuit?

Yes, 11.55V is the factory voltage for the C31N1815, so the battery communicates correctly with the ZenBook 13 charging controller.

Will this black C31N1815 pack fit inside the UX333FA chassis without forcing the bottom case?

The replacement is built to the same dimensions as the original Asus C31N1815, so it seats in the UX333FA battery bay and secures with the existing screws.

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