Asus B21N1818 Compatible Replacement Laptop Battery

Dependable Mobile Power and Extended Battery Health

The Asus B21N1818 Compatible Replacement Battery restores full un-tethered mobility to your laptop, allowing you to compute, study, and stream without remaining tied to an AC outlet. Constructed with high-grade Lithium-Polymer cells, this internal power module delivers a steady 7.7V output with a capacity of 4810mAh (37Wh) for smooth, uninterrupted daily usage and precise BIOS charge status reporting.

Precision Internal Fit and Direct Wiring Harness

Engineered to exact original equipment dimensions, this slimline internal battery features standardized mounting screw tabs and a flexible multi-pin wiring harness that plugs directly into your laptop motherboard. It installs securely inside the chassis without requiring special tools or modifications.

Integrated Protection Circuitry and Certified Safety

Equipped with an internal smart protection circuit board, this battery guards your system against over-charging, over-discharging, short circuits, and thermal buildup. Tested for cycle endurance and low self-discharge, it delivers safe and stable power across everyday workloads.