About this replacement
HP Omen 17-w000 Series — 11.1V Li-ion Replacement Battery (849571-221)
This 11.1V, 4400mAh (48.84Wh) lithium-ion battery fits the HP Omen 17-w000 series gaming laptop. It replaces OEM part numbers 849571-221, 849571-241, 849571-251, 849911-850, HSTNN-DB7K, PA06, PA06062, and TPN-Q174. When the original cell degrades and the laptop loses portable runtime, this cell restores capacity to factory spec.
- Omen 17-w000 series fit: HP used the PA06 battery platform across the Omen 17-w000 line — same 11.1V rail, same six-pin connector, same BMS handshake protocol. Models from w000 through w005ng and beyond share this cell because HP held the electrical spec constant across that generation.
- Bench tested on actual hardware: We ran this cell through a full charge and discharge cycle on the Omen 17 platform. The BMS handshake completed without error, the fuel gauge IC picked up the cell, and charge current stepped down correctly at the 80% and 95% thresholds.
- First-cycle conditioning on the Omen 17: After fitting this cell, run the laptop on battery until it hibernates at cutoff, 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.
BIOS reporting poor battery health after replacing the Omen 17 cell
The HP BIOS reads health data from EEPROM registers carried by the previous cell. When a new cell is installed, those registers are blank or mismatched, so the BIOS flags the battery as degraded before a single charge cycle runs. This is not a fault with the replacement cell. Running one full discharge-to-hibernate followed by a complete uninterrupted charge clears the old EEPROM reference and lets the BIOS write a fresh baseline. After two full cycles the health indicator should read normal.
Omen 17 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 discharge curve. The gauge estimates remaining capacity from the old curve, so the voltage cliff — where cell voltage drops sharply under combined CPU and display load — arrives earlier than the OS expects. The laptop shuts down to protect the cell before the gauge hits zero. Run two full discharge-to-hibernate cycles without interruption. After calibration, the shutdown point should align with the displayed percentage, and the cutoff voltage floor sits at approximately 9V under load.