About this replacement
Asus ROG SCAR II GL504GW-ES043T — 15.4V Li-Polymer Replacement Battery (C41N1731)
This is a 15.4V, 4300mAh (66.22Wh) Li-Polymer cell built to the C41N1731 specification. It fits the Asus ROG SCAR II GL504GW-ES043T and a wide range of ROG Strix GL504 and G715 variants. The four-cell configuration matches the original voltage rail exactly — no adapter or modification needed.
- GL504 and G715 platform compatibility: These models share the same 15.4V four-cell bus, C41N1731 part number, and identical connector pinout. The BMS handshake protocol is consistent across GL504GW, GL504GS, G715GW, and G715GV variants, so one cell spec covers the entire platform without firmware conflicts.
- Bench tested on actual hardware: We ran this cell on a GL504GW unit and monitored BMS communication across charge and discharge cycles. The protection circuit engaged correctly at low-voltage cutoff, and the charge controller accepted the cell without throwing an unrecognised-battery flag.
- Post-install discharge cycle on ROG SCAR II: After fitting this cell, run one full discharge until Windows hibernates, then charge uninterrupted to 100% without waking the system. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity and clears the inaccurate health warning that appears after every cell swap on this platform.
BIOS reporting poor battery health immediately after installation
The ROG SCAR II BIOS reads health data from the outgoing cell's EEPROM and carries that degraded profile into the new session. The replacement cell has no stored cycle history, so the firmware interprets the mismatch as a fault. Running the full discharge-to-hibernate then uninterrupted charge sequence lets the fuel gauge IC write a clean baseline to EEPROM. After one or two complete cycles, the BIOS health indicator normalises and reflects the actual cell condition.
Laptop shutting down at 20–30% shown after battery swap
This is a voltage cliff problem, not a capacity problem. Under full CPU plus display load on the GL504GW, the power draw spikes sharply — if the fuel gauge IC still holds calibration data from the old, degraded cell, it underestimates how quickly voltage drops under that load. The system hits hardware undervoltage cutoff before the displayed percentage reaches zero. Run two complete calibration cycles — full discharge to hibernate-cutoff, then a full uninterrupted charge to 100% each time — so the fuel gauge IC maps actual voltage curves against the new cell at 15.4V nominal.