About this replacement
Asus X551C / X551CA Series — 14.4V Li-ion Replacement Battery (A41N1308)
This is a 14.4V, 2200mAh Li-ion replacement battery for the Asus X551C and X551CA notebook series. It fits the full X551C line, including the X551CA-0051A2117U and X551C-SX014H variants. Cross-referenced OEM part numbers include A41N1308, A31N1319, A31N1308, and YU12008-13007D.
- X551C/X551CA platform fitment: These models share a common battery bay geometry, connector pinout, and BMS handshake protocol. The same 14.4V cell chemistry runs across the whole X551 sub-series, which is why a single part number covers the full range.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on X551CA hardware. The BMS initialised correctly, the charge controller accepted the cell without fault codes, and voltage held steady across the full discharge curve.
- Post-install calibration on the X551C: After fitting this battery, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after a cell swap on this platform.
BIOS reporting poor battery health immediately after fitting the A41N1308
The X551C BIOS reads health data from the EEPROM embedded in the battery pack. A new cell ships with reset EEPROM counters that do not match the learned data from the old pack — so the BIOS flags the battery as degraded even though it is new. This is a data mismatch, not a hardware fault. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% forces the BIOS to rewrite its learned cycle data against the new cell. After two to three cycles the health percentage normalises.
X551CA shuts down between 20–30% charge shown on screen
This is a voltage cliff symptom. When the X551CA is running the CPU and display at full load, current draw pulls the cell voltage below the BMS cutoff threshold faster than the OS fuel gauge updates — so the shutdown happens before the percentage reaches zero. The fuel gauge IC has not yet calibrated its discharge curve against the new cell's actual chemistry. Complete two or three full discharge cycles to hibernate-cutoff, then full recharge, to let the fuel gauge IC map the real voltage curve. After calibration, shutdowns below 20% shown will stop.