Asus ZenBook Duo 14 UX482EG Replacement Battery 15.4V 4050mAh

Asus ZenBook Duo 14 UX482EG-HY Series — 15.4V Li-Polymer Replacement Battery (C41N2004)

This 15.4V, 4050mAh (62.37Wh) Li-Polymer cell replaces the OEM C41N2004 battery in the Asus ZenBook Duo 14 UX482EG-HY Series and related UX482EA and UX482EG models. The dual-screen layout on these machines draws significantly more power than a standard single-panel laptop, and the original cell degrades faster as a result. This replacement restores full portable operation across the entire ZenBook Duo 14 UX482 lineup.

• UX482 series compatibility: Every UX482EA and UX482EG variant covered here shares the same C41N2004 cell format, connector pinout, and BMS handshake protocol. The secondary ScreenPad Plus display runs off the same battery rail, so voltage and cell geometry must match exactly — this cell does both.
• Bench tested on actual hardware: We ran this cell on a UX482EG unit and monitored BMS communication through the full charge cycle. The protection circuit handled charge cutoff correctly at 100%, and the fuel gauge IC received accurate data from the new cell within two calibration cycles.
• Post-install calibration on the ZenBook Duo 14: After fitting this cell, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100% without interruption. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap on UX482 units.

Why the UX482 reports poor battery health immediately after replacement

The ZenBook Duo 14's BIOS reads health data stored in the old cell's EEPROM and compares it against the new cell's initial readings. A fresh cell with no cycle history reads differently from what the firmware expects, so it flags the status as degraded or unknown. This is a firmware interpretation issue, not a cell fault. Running one full discharge-to-hibernate followed by a full uninterrupted charge completes the BIOS battery learn cycle and resolves the warning.

ZenBook Duo 14 shutting down at 20–30% shown on the fuel gauge

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The gauge reports 20–30% remaining, but the cell's real voltage under full CPU and dual-display load drops below the BMS cutoff threshold before the displayed figure reaches zero. The laptop shuts down to protect the cell, not because of a fault. Run two complete discharge-to-hibernate and full-recharge cycles — after the second cycle, the gauge IC locks onto the correct voltage floor and the shutdowns stop.