About this replacement
HP Pavilion PC 15 — 7.7V Li-Polymer Replacement Battery (BP02XL)
This is a 7.7V, 5300mAh (40.81Wh) lithium-polymer replacement battery for the HP Pavilion 15 and Pavilion 15 Touch notebook series. It fits the full Pavilion PC 15 range, including the 15-AU010WM, 15-AU018WM, and over 200 additional sub-models sharing the BP02XL form factor. OEM part numbers include HSTNN-UB7B, TPN-Q172, TPN-Q175, and 849569-421.
- Pavilion 15 series compatibility: These models share a unified battery bay dimension, the same 7.7V two-cell Li-Polymer voltage rail, and an identical SMBus BMS handshake. Any sub-model pulling the BP02XL OEM number will seat and communicate correctly with this cell.
- Bench tested on actual hardware: We ran this cell on a Pavilion 15-AU unit and cycled it through charge, full-load discharge, and thermal monitoring. The BMS negotiated correctly with the EC firmware, held stable voltage under CPU and display load, and triggered hibernation-cutoff at the expected threshold.
- First-cycle reset on Pavilion 15: 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 installing a new BP02XL
The HP Pavilion 15 EC reads health data from an EEPROM register carried over from the previous cell. When a new cell arrives with a fresh cycle count, the BIOS compares it against the old register and flags a mismatch as poor health. This is a firmware read error, not a fault with the replacement cell. Run the HP Battery Check utility after completing one full discharge-to-hibernate and uninterrupted charge cycle. Most units clear the warning automatically once the BIOS completes its learn cycle and overwrites the stale EEPROM values.
Pavilion 15 shutting down at 20–30% charge shown on screen
This is a voltage cliff symptom, not a calibration issue. Under combined CPU and display load, the cell voltage drops faster than the fuel gauge IC can track, and the laptop hits the EC low-voltage cutoff before the percentage reaches zero. It typically appears when the old cell's EEPROM discharge curve is still loaded into the fuel gauge IC. Run two full discharge-to-hibernate cycles followed by uninterrupted charges to 100%. After the second cycle, the fuel gauge IC recalibrates its discharge model against the new cell chemistry and the early shutdowns stop.