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The ASUS B31N1842 is a high-quality 11.52 V / 3,653 mAh (≈ 42 Wh) lithium-ion internal battery, designed specifically for various ASUS VivoBook and select X-series laptops:
Compatible with V5050E, S5500F, V531FL, X531FA, S531FA, S531FL
Built using Grade-A Li‑Ion cells, it includes smart protection circuits to prevent overcharging, deep discharge, overheating, and short circuits .
Comes with CE, UL, RoHS certifications.
Compact and lightweight, it installs directly inside the laptop and maintains original OEM dimensions.
| Battery Type | Li-ion rechargeable battery |
| Battery Voltage | 11.52v |
| Battery Capacity | 3653mah |
| Model | B31N1842 |
| Country of Origin | CHN |