Asus VivoBook B2402CVA Replacement Battery 11.55V 4500mAh

Asus VivoBook B2402CVA Series — 11.55V Li-Polymer Replacement Battery (0B200-04370000)

This 11.55V, 4500mAh (51.98Wh) Li-Polymer battery replaces the original cell in the Asus VivoBook 14 B2402CVA and its variants, including the B2402CVA-EB0248, B2402CVA-XS74, and B2402FVA. It fits the physical bay, matches the OEM connector, and communicates with the BIOS over the standard SMBus protocol. Part numbers 0B200-04370000 and C31N2210 confirm compatibility across the B2402 line.

• B2402CVA series fitment: Every model in this line runs the same three-cell Li-Polymer configuration on a shared 11.55V nominal rail. The connector pinout, BMS handshake protocol, and physical dimensions (200.20 × 104.10 × 7.40mm) are identical across all 18+ variants — one cell covers the entire range.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a B2402CVA unit. The BMS handshake completed without error codes, the BIOS recognised the battery immediately, and the fuel gauge IC began tracking cell voltage from the first cycle.
• Post-install calibration on the B2402CVA: After fitting this cell, run one full discharge down to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on this platform.

BIOS reporting poor battery health immediately after fitting a new cell

The B2402CVA stores charge history and health metrics in EEPROM on the battery's embedded controller — not in the cell itself. When a new cell goes in, that EEPROM history is blank or mismatched, so the BIOS flags the battery as degraded before it has run a single cycle. This is a data state, not a hardware fault. Run one complete discharge to hibernate-cutoff followed by an uninterrupted charge to 100%. After that learn cycle, the BIOS recalculates health against the new cell's actual voltage curve and clears the warning.

Laptop shuts down at 20–30% charge shown on screen

This happens when the fuel gauge IC's calibration data still maps to the old, degraded cell. Under full CPU plus display load, the new cell's voltage curve does not match the stored model, so the system hits what it calculates as a safe cutoff well above true empty. It is not the cell failing — it is a calibration mismatch. Complete two full discharge-to-hibernate and charge-to-100% cycles. After the second cycle, the fuel gauge recalibrates to the new cell's actual discharge curve and the early shutdowns stop.