Green Cell AS165 Li-ion Battery for Asus VivoBook 15 – 7.7V 48Wh 6240mAh, Replaces B21N1818 C21N1818-1

Generic replacement packs often cut corners with lower-grade cells and minimal protection, but the Green Cell AS165 takes a different path. Built around Grade A lithium-ion cells and a precision-engineered protection circuit, this battery delivers stable 7.7V output and a genuine 48Wh energy reserve. It’s a direct fit for your Asus VivoBook 15 and matches or exceeds the original B21N1818 / C21N1818-1 pack in everyday use.

Highlights

• Direct replacement for Asus VivoBook 15 A512, A512DA, A512FA, A512JA, R512F, R512U, X512, X512DA, X512FA, X512FL
• Replaces original part numbers B21N1818 and C21N1818-1
• High-capacity 6240mAh Li-ion cells – 48Wh total energy
• Nominal voltage 7.7V, 2-cell series configuration
• Integrated overcharge, over-discharge, short-circuit, and overheat protection
• CE and RoHS certified for safety and environmental compliance
• Brand-new, never refurbished – black casing

In daily use

The Green Cell AS165 fits exactly into the battery bay of your VivoBook 15 and locks securely without gaps. Once installed, the laptop recognises the pack immediately – no driver or BIOS updates required. You can expect consistent performance across hundreds of charge cycles, with the protection circuit preventing damage from voltage spikes or accidental deep discharge. Whether you are working on the go, streaming video, or running demanding applications, this battery keeps your laptop away from the wall socket for hours.

Full specifications

• Brand: Green Cell
• Model: AS165
• Battery technology: Lithium-ion (Li-ion)
• Nominal voltage: 7.7 V
• Capacity: 6240 mAh
• Energy rating: 48 Wh
• Number of cells: 2 (series configuration)
• Colour: Black
• Condition: New
• Overcharge protection: Yes
• Over-discharge protection: Yes
• Short-circuit protection: Yes
• Overheat protection: Yes
• Certifications: CE, RoHS
• Compatible laptop series: Asus VivoBook 15
• Compatible laptop models: Asus VivoBook 15 A512, A512DA, A512FA, A512JA, R512F, R512U, X512, X512DA, X512FA, X512FL
• Replaces OEM part numbers: B21N1818, C21N1818-1
• Product category: Laptop Battery

Final note

With the Green Cell AS165, you get OEM-level reliability at a fraction of the cost – a smart investment for keeping your VivoBook 15 truly portable.