About this replacement
HP Notebook 15-BS / 15-BW Series — 14.8V Li-ion Replacement Battery (JC04)
This is a 14.8V, 2400mAh (35.52Wh) Li-ion replacement battery for the HP Notebook 15-BS and 15-BW series laptops. It replaces OEM part numbers JC04, JC04XL, HSTNN-DB8E, 919701-850, and the full JC03/JC04 family. If your original cell no longer holds charge or the system flags battery health as degraded, this is the direct swap.
- 15-BS and 15-BW compatibility: Both series run the same 14.8V two-cell Li-ion architecture with the same 4-pin connector and BMS handshake protocol. HP used identical battery bays across the BS and BW chassis, so a single cell covers both lines without hardware modification.
- Bench tested on actual hardware: We ran this cell on a 15-BS unit and confirmed the BMS completed charge negotiation without fault codes. The system accepted the EEPROM data, reported correct Wh rating in HP Support Assistant, and cycled through full charge and discharge without voltage drop errors.
- Post-install calibration on 15-BS: After fitting this cell, run one full discharge until the laptop hibernates at low-battery cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell chemistry and clears the inaccurate health warning that appears after every cell swap on this platform.
BIOS reporting battery health as poor immediately after replacement
When the 15-BS BIOS first reads a new cell, it compares live capacity data against the EEPROM values stored by the old, degraded battery. The mismatch triggers a health warning because the firmware hasn't yet run a learn cycle against the new chemistry. This is not a fault with the replacement cell. Run one full discharge to hibernate-cutoff followed by an uninterrupted charge to 100% — after that cycle, the BIOS recalibrates and the warning clears.
Laptop 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 percentage displayed is still tracking the old cell's voltage-to-capacity mapping, so the system hits the low-voltage cutoff threshold while the gauge still reads a comfortable figure. The cell voltage drops below 11.1V under combined CPU and display load before the gauge catches up. Two to three full charge-discharge cycles recalibrate the fuel gauge IC and align the displayed percentage with actual cell state.