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Rectangular black lithium-polymer laptop battery pack

POWER-FENG

POWER-FENG 36Wh 7.7V Li-polymer Battery C21N1618 for Asus VivoBook F402BA R417BP L402BP X402BP

SKU CH-N02N-CT09V

36 Wh 7.7 V lithium-polymer replacement battery for select Asus VivoBook F402, R417, L402 and X402 models

  • TypeBattery
  • Battery TypeLaptop Batteries
  • 36 Wh capacity powers longer unplugged sessions
  • 7 V Li-polymer chemistry matches original spec
  • 4780 mAh rating delivers consistent daily runtime
  • Replaces C21N1618 for direct drop-in fit
  • Compatible with VivoBook 402 and 417 series

Compatible Replacement Battery

The POWER-FENG C21N1618 is a 36Wh 7.7V Li-polymer battery designed for Asus VivoBook models including F402BA, R417BP, L402BP and X402BP series. It replaces the original C21N1618 part number and suits owners of those specific laptops who need a new power source. Buyers with different VivoBook series or other brands should verify their exact model number first.

Black Li-polymer Construction

The black Li-polymer pack delivers a capacity of 36Wh and 4780mAh at 7.7V, matching the electrical specification of the original component. Its form factor aligns with the internal battery bay of the listed F402, R417, L402 and X402 chassis so the laptop closes normally and the existing connector seats without adapters. No additional cables or mounting hardware are required for installation.

Verify Model Before Ordering

Confirm the laptop model appears in the supported list: E402BA, E402BP, E402B, F402BA, F402BP, R417BA, R417BP, L402BA, L402BP, X402B, X402BA or X402BP. Check the original battery label for part number C21N1618 to ensure an exact match. This unit will not fit VivoBook models outside the listed series or laptops requiring a different voltage or connector layout.

Highlights

  • 36 Wh capacity powers longer unplugged sessions
  • 7 V Li-polymer chemistry matches original spec
  • 4780 mAh rating delivers consistent daily runtime
  • Replaces C21N1618 for direct drop-in fit
  • Compatible with VivoBook 402 and 417 series

Specifications

TypeBattery
Battery TypeLaptop Batteries

Questions about this item

What voltage does the 7.7V Li-polymer battery deliver and how does that affect compatibility?

The battery operates at 7.7 volts and is designed as a direct replacement for the original C21N1618 pack used in compatible VivoBook models.

What physical space is required to fit this battery inside a VivoBook F402BA or similar model?

It matches the original C21N1618 form factor so it slots into the existing battery bay of listed VivoBook E402, F402, R417, L402 and X402 series without modification.

How is the battery installed and which step do people often miss?

Power off the laptop, remove the bottom case screws, disconnect the old battery cable, fit the new pack, reconnect the cable securely, then reassemble — the cable reconnection is the step most often forgotten.

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