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Black rectangular laptop battery with smooth finish

Beisite

Beisite C31N1539 57Wh 11.55V laptop battery for Asus ZenBook UX305UA UX305UAB

SKU CH-6N1X-01R86

A 57 Wh lithium-ion replacement battery for Asus ZenBook UX305UA and UX305UAB models

  • ColorBlack
  • TypeBattery
  • Compatibilityfor ZenBook U305U UX305UA UX305UAB UX305UA-AS51 Series
  • Battery TypeLithium-Ion
  • Battery Voltage11.55 V
  • Battery Capacity57Wh
  • 57 Wh capacity extends unplugged work time
  • 55 V lithium-ion cell matches original power spec
  • Replaces C31N1539, C31Pn9H, 31CP4/91/91, 0B200-01180200 part numbers
  • Fits ZenBook UX305UA and UX305UAB models
  • 12-month warranty backs reliable daily use

Replacement battery for ZenBook UX305 series

This 57 Wh lithium-ion unit replaces the original C31N1539 cell in Asus ZenBook UX305UA and UX305UAB ultrabooks. It delivers 11.55 V and 4800 mAh in a black housing. The pack is new and carries a 12-month warranty.

Direct substitute for C31N1539 and 31CP4/91/91

The battery matches part numbers C31N1539, C31Pn9H, 31CP4/91/91 and 0B200-01180200. Swap it in when the original pack no longer holds sufficient charge for a full work session. The upgrade is worth it once runtime drops below what your daily mobility requires.

Limited to 11.55 V platform and integrated chassis

The cell fits only the listed ZenBook U305U and UX305 models; it will not work in laptops that demand a different voltage or form factor. Capacity is fixed at 57 Wh, so extended off-grid use still requires an external power source.

Highlights

  • 57 Wh capacity extends unplugged work time
  • 55 V lithium-ion cell matches original power spec
  • Replaces C31N1539, C31Pn9H, 31CP4/91/91, 0B200-01180200 part numbers
  • Fits ZenBook UX305UA and UX305UAB models
  • 12-month warranty backs reliable daily use

Specifications

BrandC31N1539
ModelC31N1539
Part Number31CP4/91/91
ColorBlack
TypeBattery
Compatibilityfor ZenBook U305U UX305UA UX305UAB UX305UA-AS51 Series
Battery TypeLithium-Ion
Battery Voltage11.55 V
Battery Capacity57Wh

Questions about this item

What dimensions and connector does the C31N1539 battery need to fit the ZenBook UX305UA?

The battery is built to the original 11.55 V 57 Wh form factor with the matching 31CP4/91/91 connector, so it seats directly in the ZenBook UX305UA and UX305UAB battery bay.

What is the correct installation sequence and the step users often skip?

Power off the laptop, disconnect the AC adapter, remove the bottom case screws, unplug the old battery cable, connect the new C31N1539 cable firmly, then reassemble — the step often missed is disconnecting the old battery before fitting the new one.

When will the 57 Wh lithium-ion pack need replacing?

Capacity gradually falls after many charge cycles; replace the pack when run time no longer meets your needs.

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