KL06XL HP Envy 15 Compatible Battery 11.58V 6750mAh

HP Envy 15-EP0098NR — 11.58V Li-Polymer Replacement Battery (KL06XL)

This is an 11.58V, 6750mAh (78.17Wh) Li-Polymer battery for the HP Envy 15-EP0098NR and the broader Envy 15-EP0000/EP0008 notebook series. It replaces OEM part KL06XL and cross-references HSTNN-IB9M, L85853-1C1, and L85885-005. The battery fits the internal bay directly and connects to the existing BMS circuit without modification.

• Envy 15-EP0000 / EP0008 series fit: These 26 models share the same 11.58V three-cell Li-Polymer architecture, identical connector pinout, and the same BMS handshake protocol. The KL06XL part number applies across the full EP0000 through EP0098 production run, so one cell fits all without adapter changes.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on a live EP-series board. The BMS accepted the cell without fault codes, balanced all three groups correctly, and held stable voltage under combined CPU and display load at the high end of the draw range.
• Post-install discharge cycle: After fitting this cell, run a full discharge until Windows triggers hibernation, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity and clears the inaccurate health warning that appears after any cell swap on this platform.

Why the Envy 15-EP BIOS reports poor battery health after a cell swap

The HP Envy 15-EP platform stores battery health data in EEPROM on the BMS board. When a new cell goes in, the EEPROM still holds the wear history from the old cell. The BIOS reads that stored data and immediately flags poor health — not the actual condition of the new cell. Running one full discharge-to-hibernate followed by a clean charge to 100% triggers the BIOS learn cycle, which overwrites the EEPROM values with real readings from the new cell. After two to three cycles, the health status clears.

Laptop shuts off at 20–30% charge shown after battery replacement

This happens when the fuel gauge IC still references calibration data from the old, degraded cell. The percentage shown is calculated against the old cell's shrunken capacity floor, so when the new cell hits what the old cell's voltage cliff was, the system cuts power. The fix is a calibration cycle: discharge fully until hibernation triggers, then charge to 100% without interruption. After two full cycles the fuel gauge IC re-maps its curve to the new cell and the reported percentage aligns with actual remaining charge — confirmed at roughly 3.86V per cell at the 20% mark on our bench tests.