About this replacement
HP Envy 6-1000 Series — 14.8V Li-Polymer Replacement Battery (HD04XL)
This is a 14.8V, 3040mAh (44.99Wh) Li-Polymer battery for the HP Envy 6-1000 series and compatible Envy Spectre XT models. It replaces OEM part numbers HD04XL, 685866-1B1, 685989-001, HSTNN-IB3V, and TPN-C104. Fit the battery and the laptop powers up — no driver installs, no firmware flashing required.
- Envy 6-1000 and Spectre XT compatibility: These thin-chassis HP models share the same flat Li-Polymer cell format, 14.8V nominal rail, and four-pin SMBus connector. The BMS handshake matches the original — the BIOS reads cell voltage and charge state without errors once the learn cycle completes.
- Bench tested on actual hardware: We ran this cell through a full charge-discharge cycle on an Envy 6-1063cl. The BMS balanced both cell pairs correctly, charge termination triggered at the expected voltage ceiling, and the SMBus reported accurate state-of-charge data to the OS.
- First-cycle calibration on Envy hardware: After installing, 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 after every cell swap on this platform.
BIOS reporting battery health as poor after fitting a new cell
The Envy 6 BIOS stores charge-cycle history and health data in the old cell's EEPROM. When you swap the battery, that data is gone — the BIOS flags the new cell as unknown or degraded because it has no history to read. This is a firmware artefact, not a fault with the replacement. Run the full discharge-to-hibernate then uninterrupted charge cycle described above. After two or three full cycles, the BIOS rewrites its health table and the warning clears.
Laptop shuts down at 20–30% shown on the fuel gauge
This happens when the fuel gauge IC hasn't been calibrated against the new cell's actual charge curve. The OS reads a voltage that the old calibration table maps to 25%, but the new cell's voltage cliff is at a different point — the laptop shuts down before the gauge catches up. It is not a defective cell. Run two complete discharge-to-hibernate cycles without interruption. By the third cycle the fuel gauge IC has enough data to map the new cell accurately, and the shutdowns stop. Confirm the cell voltage at hibernate is between 11.4V and 11.8V — anything below 11V indicates a deeper calibration reset is needed via HP Support Assistant.