Asus ROG Zephyrus S GX531GV Replacement Battery C41N1828 15.44V

Asus Zephyrus S GX531GV — 15.44V Li-Polymer Replacement Battery (C41N1828)

This is a 15.44V, 3750mAh (57.9Wh) Li-Polymer battery for the Asus ROG Zephyrus S GX531GV gaming laptop. It fits the GX531GV, GX531GW-ES006T, GX531GW-AS73, and the ROG Zephyrus S GX531GV-ES007T among others. It replaces OEM part C41N1828 and 0B200-03020200 directly.

• GX531 series fit: The GX531GV and GX531GW share the same 4-cell Li-Polymer configuration, voltage rail, and BMS connector pinout. This battery covers both variants without modification.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the GX531 platform. The BMS handshake completed correctly, charge termination triggered at the expected voltage ceiling, and the protection circuit responded normally to load spikes during GPU stress testing.
• Post-install calibration on the GX531: After fitting this battery, run one full discharge until the laptop hibernates, 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 GX531GV shuts down at 20–30% remaining after a battery swap

The GX531's fuel gauge IC stores discharge curve data from the previous cell in EEPROM. When a new cell goes in, that stored curve no longer matches the actual chemistry, so the IC misjudges remaining capacity. Under full CPU and GPU load the new cell hits a voltage cliff while the gauge still reads 20–30%. The BIOS interprets the sudden voltage drop as a critical event and forces shutdown before the OS can respond. One full discharge-to-hibernate cycle followed by an uninterrupted charge forces the IC to relearn the new cell's discharge profile and eliminates the premature cutoff.

BIOS reporting the replacement battery's Wh rating incorrectly in system info

The Wh value shown in BIOS and HWiNFO on the GX531 is pulled from EEPROM data written by the original OEM cell — not read live from the new cell's chemistry. After a swap, that stored value persists until the learn cycle overwrites it. Run the full calibration cycle described above and the reported Wh will update to reflect the actual installed capacity. If the value still reads incorrectly after one full cycle, check that the battery connector is fully seated, as a partial connection can cause the BMS to report stale EEPROM data indefinitely.