Iru G15X Replacement Battery 14.8V 4000mAh Li-Polymer

Iru G15X — 14.8V Li-Polymer Replacement Battery

This 14.8V, 4000mAh (59.2Wh) lithium-polymer cell replaces the original battery in the Iru G15X notebook. It fits the G15X platform directly, restoring portable power to units where the factory cell has degraded or failed. Voltage and connector match the original spec.

• G15X platform fit: The G15X uses a 14.8V four-cell Li-Polymer configuration. This replacement matches that voltage rail and connector pinout, so the BMS handshake between the battery and the motherboard completes correctly on first boot.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on the bench, confirming the BMS protection circuits trip at the correct cutoff voltages. Overcharge and over-discharge protection both responded within spec.
• Post-install calibration cycle: After fitting this battery, run the laptop down to hibernate cutoff, then charge uninterrupted to 100% without interruption. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after most cell swaps on this platform.

BIOS reporting poor battery health immediately after installing the G15X replacement cell

The G15X BIOS reads health data from EEPROM registers that were written by the original factory cell. When a replacement cell goes in, those registers still hold the old cell's degraded state data. The system flags the new battery as poor health because it hasn't yet overwritten the stored values. Running one full discharge-to-hibernate followed by a complete uninterrupted charge to 100% triggers the BIOS learn cycle, which rewrites those registers against the new cell's actual capacity. After two to three calibration cycles the health reading normalises.

G15X shutting down at 20–30% charge shown on the OS gauge

This is a voltage cliff issue, not a gauge fault. Under combined CPU and display load the cell voltage drops faster than the fuel gauge IC can track, and the BMS cuts power before the displayed percentage reaches zero. It typically appears within the first few cycles when the fuel gauge IC hasn't yet calibrated against the new cell's discharge curve. Run two full discharge cycles — down to hibernate cutoff each time — then charge fully. The gauge IC maps the actual voltage curve after those cycles and the premature shutdowns stop. If cutoffs continue past three cycles, check that the BIOS battery learn mode is not disabled in firmware settings.