About this replacement
Asus VivoBook Max X541SA — 10.8V Li-ion Replacement Battery (A31N1601)
This is a 10.8V, 2200mAh Li-ion replacement battery for the Asus VivoBook Max X541SA and X541UV series laptops. It carries OEM part numbers A31N1601, A31LP4Q, 0B110-00440000, and 0B110-00440100. If the original cell is dead, swollen, or no longer holding charge, this is the direct swap.
- X541 series compatibility: The X541SA, X541UV, X541SA-3F, X541SC-1A, and 257 additional X541 variants share the same connector pinout, voltage rail, and BMS handshake protocol — one SKU covers the full lineup without adapter or modification.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the X541 platform. The BMS communicated correctly with the BIOS, accepted charge without thermal fault, and held voltage through discharge without early cutoff.
- First-cycle recalibration on the X541SA: After installation, 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 every cell swap on this platform.
Why the X541SA BIOS reports poor battery health immediately after replacement
The X541 platform stores battery health data in EEPROM on the original cell's BMS board. When a new cell is installed, the BIOS reads no matching history and flags the battery as degraded or unknown. This is a data mismatch, not a fault with the replacement cell. Running one complete discharge-to-hibernate followed by a full uninterrupted charge gives the BIOS enough cycle data to recalculate health accurately. After two to three full cycles, the reported health figure stabilises.
Laptop shuts down at 20–30% remaining after battery swap
This happens because the fuel gauge IC is still referencing the old cell's discharge curve. The new cell hits a voltage cliff under combined CPU and display load at a point the IC hasn't yet mapped. The laptop interprets that voltage drop as empty and cuts power before the actual capacity is used. Run three full discharge-to-hibernate and full recharge cycles to recalibrate the fuel gauge against the new cell's curve. After calibration, the gauge tracks accurately and the early shutdowns stop.