About this replacement
HP Pavilion X360 14-BA Series — 11.55V Li-Polymer Replacement Battery (BK03XL)
This is an 11.55V, 3500mAh (40.43Wh) Li-Polymer battery for the HP Pavilion X360 14-BA series convertible laptop. It replaces OEM part BK03XL and fits models including the 14-BA013NL, 14-BA102NX, 14-BA015NG, and 14-BA075TX, among 167 additional variants. The connector and BMS handshake match the original HP battery management interface used across this generation.
- 14-BA series platform compatibility: Every Pavilion X360 14-BA model in this generation runs the same voltage rail, connector pinout, and BMS communication protocol. HP did not change the battery interface across the BA sub-variants, so one cell fits the full range without modification.
- Bench tested on actual hardware: We ran this cell on a 14-BA unit and confirmed the BMS handshake completed correctly — no unrecognised battery warnings at POST, charge current accepted normally, and the fuel gauge IC began tracking state-of-charge after the first full cycle.
- First-cycle calibration on the X360 14-BA: After installation, run one full discharge down 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 poor battery health immediately after replacement
The HP BIOS on the 14-BA platform reads health data from the battery's EEPROM on first boot. The new cell carries fresh EEPROM values that do not match the learned discharge curve the BIOS built up from the old pack. This mismatch triggers a false "battery not functioning properly" warning. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% resets the learn cycle and clears the flag on the next boot.
Pavilion X360 shutting down at 20–30% charge shown
This happens when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. The displayed percentage is based on the old cell's data, so the voltage cliff — where Li-Polymer cells drop sharply below ~10.8V under full CPU and display load — arrives earlier than the gauge predicts. The laptop cuts power to protect the cell before the screen reaches 0%. Complete two or three full discharge-and-charge cycles without interruption and the fuel gauge IC will recalibrate; shutdowns at false percentages stop once it maps the actual voltage curve of the replacement cell.