About this replacement
HP 15-F018DX Series — 11.1V Li-ion Replacement Battery (775625-221)
This is an 11.1V Li-ion battery rated at 2600mAh (28.86Wh), direct replacement for the HP 15-F018DX and related 15-F and 14-y series notebooks. It slots into the same bay, uses the same connector, and communicates with the same HP battery management circuit. OEM part numbers 775825-221, 776622-001, HSTNN-DB6N, HSTNN-IB6R, LA03, LA03DF, and LA03031DF all cross to this cell.
- 15-F and 14-y series compatibility: These models share the same 11.1V three-cell architecture, identical physical bay dimensions, and the same BMS handshake protocol — that's why one cell covers the full range without modification.
- Bench tested on actual hardware: We cycled this cell on an HP 15-F chassis and confirmed the BMS accepted full charge authority, balanced across all three cells, and released discharge current without a protection trip under sustained CPU and display load.
- Post-install calibration for HP 15-F: After fitting this cell, run the laptop down to automatic hibernate on battery only, then charge uninterrupted to 100%. This forces the HP BIOS to complete its battery learn cycle and clears the inaccurate health warning that appears after every cell swap.
Why the HP 15-F shuts down at 20–30% after a battery swap
The HP BIOS fuel gauge IC builds its discharge model against the old cell's EEPROM data. When a new cell goes in, the stored capacity curve no longer matches the actual voltage profile of the fresh chemistry. The gauge reads the voltage floor of the old cell and triggers a low-battery shutdown long before the new cell is actually empty. One full discharge-to-hibernate cycle followed by an uninterrupted charge forces the fuel gauge to recalibrate against the new cell. After two or three full cycles, shutdown accuracy stabilises.
BIOS reporting new battery health as "poor" or "replace soon" immediately after install
HP's battery health check reads cumulative cycle count and internal resistance data stored in the cell's EEPROM — values that don't reset just because the hardware is new. A replacement cell sourced from a different production batch may carry EEPROM metadata that the BIOS interprets as aged. This is a data mismatch, not a fault with the cell itself. Run one full discharge-to-hibernate then charge to 100%; the BIOS rewrites its health baseline from the new cell's actual behaviour, and the warning clears.