About this replacement
HP Notebook x2 10-P Series — 7.4V Li-Polymer Replacement Battery (SW02XL)
This is a 7.4V, 4200mAh (31.08Wh) Li-Polymer replacement battery for the HP Notebook x2 10-P series, including the 10-P018WM, 10-P014NF, and x2 210 G2 (L5H44EA). It cross-references OEM part numbers SW02XL, HSTNN-IB7N, 859517-855, 859470-1B1, TPN-Q180, and TPN-Q181. The slim 3.24mm profile matches the original cell in the hybrid tablet-laptop chassis.
- Notebook x2 10-P platform fit: The 10-P series shares a common 7.4V two-cell Li-Polymer architecture across SKUs. The connector pinout, BMS handshake voltage, and physical footprint are identical across these variants, which is why one cell covers the full range.
- Bench tested on actual hardware: We ran this cell on a 10-P018WM unit. The BMS completed charge negotiation without error, the fuel gauge IC registered the new cell, and the BIOS accepted the handshake without a "battery not detected" flag on first boot.
- Post-swap recalibration on the x2 10-P: After installing, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. The HP BIOS on this platform stores learned capacity data from the old cell — skipping this step leaves the fuel gauge reading against stale EEPROM values and triggers false health warnings in HP Support Assistant.
Why the Notebook x2 shuts down at 20–30% after a battery swap
The HP Notebook x2 BIOS tracks a voltage floor threshold learned from the previous cell's discharge curve. A new Li-Polymer cell holds a slightly different voltage profile under combined CPU and display load. When the system hits what it thinks is the safe cutoff — based on old data — it forces shutdown even though charge remains. This is not a fault with the replacement cell. Running two full discharge-to-hibernate and charge-to-100% cycles resets the learned curve. After calibration, the shutdown threshold aligns to the new cell's actual 3.0V floor per cell.
HP Support Assistant flagging the new cell as "poor health" or "unknown"
HP Support Assistant reads battery health from EEPROM data embedded in the BMS — not from a live cell measurement. When a replacement cell is installed, the EEPROM reports manufacture date and cycle count from the new cell, which doesn't match the aged profile the OS was previously tracking. This mismatch causes Support Assistant to display "poor health" or "unknown battery" immediately after install. It is not a defect. Complete one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100%, then relaunch HP Support Assistant — the health status resets once the fuel gauge IC writes fresh data to the EEPROM register.