Asus VivoBook E410 Replacement Battery 11.55V 3450mAh B31N1912

Asus E410MA / VivoBook 14 Series — 11.55V Li-Polymer Replacement Battery (B31N1912)

This is an 11.55V, 3450mAh (39.85Wh) lithium-polymer replacement battery for the Asus E410, E410MA, and VivoBook 14 L410MA and E410MA series laptops. It replaces OEM part numbers B31N1912 and 0B200-03680000. If your E410 no longer holds charge or shuts down unexpectedly, this cell fits the original bay and connector without modification.

• E410MA and VivoBook 14 L410MA fitment: These models share the same three-cell Li-Polymer configuration, 11.55V voltage rail, and BMS handshake protocol — which is why one part number covers the full platform range including the EK211T and BV076TS variants.
• Bench tested on actual hardware: We cycled this cell on an E410MA board. The BMS accepted the cell without fault codes, charge accepted from 0V, and the fuel gauge IC registered the correct 39.85Wh rating after two full cycles.
• Post-swap calibration on the E410MA: After fitting, run a full discharge to hibernate cutoff — do not interrupt it — then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell and clears the false "poor health" or "replace battery" warning that appears in Windows after every cell swap on this platform.

BIOS reporting poor battery health after installing a new cell on the E410MA

The E410MA stores battery health data in EEPROM on the original cell. When you swap the cell, the BIOS reads no history and flags the battery as unknown or poor condition — even if the new cell is fully functional. This is a firmware behaviour, not a fault with the replacement. Running one complete discharge-to-hibernate followed by an uninterrupted charge to 100% writes new baseline data to the BIOS learn cycle. After two to three cycles, Windows battery health reporting normalises and the warning clears.

E410 shutting down at 20–30% charge shown on screen

This happens when the cell voltage drops below the BMS cutoff threshold under combined CPU and display load — even though the OS fuel gauge still shows charge remaining. The fuel gauge IC calibrates against the old cell's discharge curve, so its percentage reading and the actual cell voltage fall out of sync. The fix is the same calibration cycle: discharge fully to hibernate, then charge to 100% without interruption. After two cycles the fuel gauge IC maps the new cell's voltage curve and the early shutdowns stop. Check battery voltage in HWiNFO64 — at 20% remaining it should read above 10.8V; if it reads below 10.2V under load, the calibration cycle is still incomplete.