Extra Digital Advanced NB432561 Replacement Laptop Battery for ASUS VivoBook 15 (C21N1818-1, 4150mAh, 7.7V, Li-ion)

When your ASUS VivoBook 15 starts shutting down at 20% battery or no longer survives a morning of meetings, the internal battery is usually the culprit. This Extra Digital Advanced NB432561 replacement restores the original runtime, letting you work from cafés, lecture halls, or client sites without hunting for a power outlet. It is a direct replacement for the ASUS C21N1818-1 battery, designed for a precise fit and reliable performance.

Key specifications

• Battery Type: Lithium-ion (Li-ion)
• Model Number: C21N1818-1
• Capacity: 4150 mAh
• Voltage: 7.7 V
• Energy: 31.96 Wh
• Number of Cells: 2
• Colour: Black
• Compatible with ASUS VivoBook 15 series including X512, F512, R521, A512, K512, M512, S512, V5000J, and more.
• Replaces part numbers: C21N1818-1 and 0B200-03290000

Why choose it

This battery features multiple protection mechanisms: overcharge, over-discharge, short-circuit, over-current, and over-temperature protection. It is CE, FCC, and RoHS certified, ensuring safe operation and compliance with European standards. The battery is brand new and ready to install, offering a simple alternative to purchasing a new laptop.

Ideal use cases

• Replacing a degraded or swollen battery in an ASUS VivoBook 15.
• Extending the life of a laptop used for business, education, or personal productivity.
• Carrying a spare battery for long travel days (if your model supports external swapping).

Good to know

Please verify your laptop model and part number before ordering. This battery is designed for internal installation; if you are not confident, consult a qualified technician. It is a 2-cell Li-ion pack delivering 31.96 Wh and is compatible with the listed ASUS VivoBook 15 models.