About this replacement
Asus VivoBook X200CA / F200CA / X200MA — 11.25V Li-ion Replacement Battery (A31N1302)
This is an 11.25V, 2900mAh (32.63Wh) Li-ion cell for the Asus VivoBook X200CA, F200CA, and X200MA series. It replaces OEM part numbers A31N1302, 0B110-00240100E, A31LMH2, A31LM9H, and A31LM2H. The connector and BMS communication protocol match the original Asus battery controller on these boards.
- X200CA / F200CA / X200MA compatibility: These three models share the same 11.25V three-cell series configuration, identical connector pinout, and the same SMBus BMS handshake — one cell fits all three without modification or adapter.
- Bench tested on actual hardware: We ran this cell on an X200CA board and confirmed the BMS completed a full charge cycle to 11.25V, reported correct state-of-charge to the EC, and tripped no protection flags during a load discharge to the low-voltage cutoff threshold.
- Post-install calibration on X200CA: After fitting this cell, run the laptop down to hibernate-cutoff on battery only — no charger — then charge uninterrupted to 100%. This forces the Asus BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap on this platform.
BIOS reporting battery health as poor after fitting a new cell on X200CA
The X200CA BIOS reads EEPROM data written by the original cell over its lifetime. When a new cell arrives, that stored cycle count and degradation history does not match the fresh chemistry. The BIOS flags the mismatch as a fault. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% forces the firmware to rewrite that data against the new cell. After two to three cycles the health indicator returns to normal.
VivoBook X200CA shutting down at 20–30% charge shown on screen
This usually happens when an aged cell can no longer hold voltage under combined CPU and display load — the cell voltage drops below the EC's cutoff threshold before the fuel gauge reads zero. The fuel gauge IC calibrated itself to the old cell's degraded capacity, so the percentage shown does not reflect the real remaining voltage curve. A full discharge-to-shutdown followed by a full charge resets the fuel gauge IC against the new cell's actual curve. After two calibration cycles, shutdown should not occur above 5–8% indicated charge.