About this replacement
Asus ZenBook 15 UX562 Series — 15.4V Li-Polymer Replacement Battery (C41N1809)
This is a 15.4V, 3700mAh (56.98Wh) lithium-polymer battery for the Asus ZenBook 15 UX562 series. It fits the UX562, UX562FN, UX562FD-2G, and compatible variants. OEM part numbers C41N1809 and 0B200-03070000 both cross-reference this cell.
- UX562 series compatibility: These models share the same 15.4V four-cell Li-Polymer architecture, identical connector pinout, and the same BMS communication protocol used by the Asus EC firmware. Swapping between UX562 variants does not require any hardware modification.
- Bench tested on actual hardware: We ran this cell through charge, discharge, and BMS handshake verification on UX562 hardware. The EC recognised the battery, accepted a full charge cycle, and the BMS protection thresholds triggered correctly at both ends of the voltage window.
- Post-install calibration cycle: After fitting this battery, run one full discharge to the hibernate cutoff point, 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 UX562 firmware.
BIOS reporting poor battery health immediately after replacement
The Asus EC stores learned capacity data from the old cell in its firmware. When a new cell is fitted, that stored data does not match the new cell's EEPROM values, so the BIOS flags the battery as degraded before it has completed a single cycle. This is a firmware state issue, not a fault with the replacement cell. Running one complete discharge-to-hibernate followed by an uninterrupted charge to 100% forces the EC to rewrite its learned cycle data against the new cell.
Laptop shuts down abruptly at 20–30% charge shown on screen
This happens when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. The OS reads a voltage that maps to 25% on the old curve, but the new cell hits its minimum sustain voltage under combined CPU and display load before the gauge catches up. The BMS cuts power to protect the cell, which looks like a sudden shutdown. Run two to three full discharge-and-charge cycles and the fuel gauge IC recalibrates its curve — the cutoff point will move back toward 5% where it belongs.