Asus Vivobook 14 B3404CV Replacement Battery 11.61V 5400mAh

Asus Vivobook B3404CV / Chromebook CM34 — 11.61V Li-Polymer Replacement Battery (0B200-04010000)

This 11.61V, 5400mAh (62.69Wh) Li-Polymer battery replaces the original cell in the Asus Vivobook B3404CV, CM3401FFA, and Chromebook CM34 Flip series. It matches OEM part numbers 0B200-04010000, 0B200-04310000, and C31N2205. The connector, BMS handshake, and physical dimensions are matched to these models exactly.

• B3404CV and CM34 series fitment: These models share the same 11.61V three-cell Li-Polymer architecture, identical connector pinout, and the same BMS communication protocol — which is why one cell covers the full range. Swapping to a mismatched voltage rail will trigger an immediate BIOS rejection and the laptop will refuse to charge.
• Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on the B3404CV platform. The BMS handshake completed without fault codes, charge current stepped down correctly at 80% and 95% thresholds, and the cell held steady voltage through a sustained CPU and display load test.
• Post-install calibration on Asus BIOS: After fitting this cell, run one full discharge to hibernate cutoff — do not force-shutdown — then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the false "poor health" warning that appears after every cell swap on these Vivobook and Chromebook CM34 platforms.

Why the B3404CV reports poor battery health immediately after a cell swap

The Asus BIOS stores learned capacity and cycle count data from the previous cell in its EEPROM. When a new cell is installed, that stored data no longer matches the actual cell chemistry, so the BIOS flags the battery as degraded. This is not a fault with the replacement cell — it is a calibration mismatch. Running the learn cycle (full discharge to hibernate, then uninterrupted charge to 100%) overwrites the stale EEPROM data. After one or two full cycles, the health indicator returns to normal.

Laptop shuts off at 20–30% shown on the fuel gauge after replacement

This happens when the fuel gauge IC has not yet mapped the new cell's voltage-to-capacity curve. Under full CPU and display load, the cell voltage drops faster than the uncalibrated gauge predicts, and the system hits its low-voltage cutoff while the display still shows charge remaining. The fix is calibration — discharge fully to hibernate without interruption, then charge to 100% in one session. After two or three complete cycles, the gauge IC locks onto the correct curve and the early shutdowns stop.