HP Spectre X360 14T Replacement Battery WS04XL 7.7V 8150mAh

HP Spectre X360 14T — 7.7V Li-Polymer Replacement Battery (WS04XL)

This is a 7.7V 8150mAh (62.76Wh) Li-Polymer battery for the HP Spectre X360 14T convertible ultrabook. It fits the 14T-EA000 series and specific 14-ea0000 variants including the ea0007na and ea0002ni. When the original WS04XL cell degrades and the laptop stops holding a charge, this replacement restores cordless operation.

• Spectre X360 14T series compatibility: The 14T and 14-ea0000 models share the same 7.7V two-cell Li-Polymer rail, flat form factor connector, and BMS handshake protocol — which is why OEM part numbers WS04XL, WS04066XL, and HSTNN-DB9Z all cross-reference to the same physical cell and PCB configuration.
• Bench tested on actual hardware: We ran this cell on a Spectre X360 14T unit and confirmed the BMS initialised correctly, the charge controller accepted the cell without fault codes, and charge progression through all four stages completed without interruption.
• Post-install calibration on the Spectre X360 14T: After fitting this cell, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears in HP Support Assistant after every cell swap.

BIOS reporting poor battery health immediately after fitting a new WS04XL cell

The HP Spectre X360 14T reads battery health from EEPROM data written by the original cell. When a replacement cell is installed, the BIOS has no matching EEPROM record and flags the battery as degraded or unknown — even when the cell is brand new. This is a firmware behaviour, not a battery fault. Running a full discharge-to-hibernate followed by a complete uninterrupted charge gives the BIOS controller enough cycle data to re-evaluate the cell. After one or two calibration cycles, the health indicator in HP Support Assistant returns to normal.

Spectre X360 14T shutting down at 20–30% charge shown on screen

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The gauge reads 20–30% but the cell voltage has already dropped below the safe cutoff threshold under combined CPU and display load — so the system shuts down to protect the hardware. The old cell's discharge profile is still stored in the gauge IC and does not match the new cell. Perform a full discharge to hibernate-cutoff, then charge to 100% without interruption — after two complete cycles the gauge re-maps the curve and shutdowns stop occurring above 4.2V per cell.