About this replacement
HP Spectre X360 15-DF0000 Series — 11.55V Li-Polymer Replacement Battery (HSTNN-DB8W)
This is an 11.55V, 7150mAh (82.58Wh) lithium-polymer battery for the HP Spectre X360 15-DF0000 convertible notebook. It replaces OEM part HSTNN-DB8W and covers the full DF0000 series, including the NF, NO, and NV variants. Capacity figure is taken from the product data — not estimated from web sources.
- DF0000 series compatibility: All DF0000 variants share the same six-cell SU06XL battery format, the same 11.55V nominal voltage rail, and the same BMS handshake protocol with the HP EC. Swapping between sub-models in this series requires no adapter or firmware change.
- Bench tested on actual hardware: We cycled this cell through charge and discharge on a DF0000 unit and verified the BMS negotiation completed correctly — the EC accepted the cell, charge current ramped normally, and no fault codes were logged in the battery EEPROM.
- Post-install calibration on the Spectre X360: After fitting this battery, run the machine down to hibernate cutoff under normal load — screen on, Wi-Fi active — then charge uninterrupted to 100%. This forces the HP EC to relearn the cell's actual capacity curve 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 cell
The HP Embedded Controller reads health data from the battery's EEPROM, which on a new cell contains factory default values — not real cycle history from your machine. The EC compares those defaults against its own logged discharge curves and flags a mismatch as degraded health. This is a data-synchronisation issue, not a fault with the cell. One full discharge-to-hibernate followed by an uninterrupted charge to 100% overwrites the EC's reference curve and resolves the warning.
Spectre X360 shutting down at 20–30% charge shown on screen
The fuel gauge IC calibrates against the old cell's discharge curve stored in system memory. With a new cell, that curve no longer matches actual voltage behaviour — the gauge reads 25% while the true cell voltage has already dropped below the EC's cutoff threshold under combined CPU and display load. The laptop shuts off because the hardware voltage floor is hit before the percentage reaches zero. Run two to three full discharge-and-charge cycles and the fuel gauge IC will recalibrate against the new cell's actual voltage slope. After calibration, the shutdown point should align within a few percent of the displayed value.