About this replacement
HP Pavilion 15 UHD / OMEN 15-AX — 11.55V Li-ion Replacement Battery (TE03XL)
This is an 11.55V, 5100mAh (58.91Wh) Li-ion battery for the HP Pavilion 15 UHD, Pavilion 15-BC series, and OMEN 15-AX series laptops. It replaces OEM part TE03XL and cross-references HSTNN-UB7T, HSTNN-UB7A, and 849570-541 among others. Fits the physical bay and connector directly — no modification needed.
- Pavilion 15-BC and OMEN 15-AX compatibility: These models share a three-cell 11.55V architecture with the same 3ICP7/65/80 cell arrangement and identical BMS handshake protocol over the SMBus line. The TPN-Q173 board ID is what the BIOS queries at POST — this battery answers that query correctly.
- Bench tested on actual hardware: We ran this cell on a Pavilion 15-BC unit and monitored the SMBus communication during charge cycles. The BMS negotiated charge current correctly, reported accurate state-of-charge data to the EC, and did not trigger any abnormal cutoff events under sustained CPU and GPU load.
- First-cycle calibration on HP Pavilion platforms: After fitting this battery, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This forces the HP BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears in HP Support Assistant after every cell swap.
Why the Pavilion 15 BIOS reports poor health immediately after replacement
The HP EC reads health data from the battery's EEPROM, which stores cycle count, design capacity, and wear flags from the previous cell. A new battery carries factory-default EEPROM values that don't match the learned profile the BIOS accumulated from the old cell. This mismatch triggers a "battery not detected" or "consider replacing your battery" flag in HP Support Assistant within the first boot. It is not a fault with the new cell — it is a calibration state. Run one full discharge-to-hibernate followed by an uninterrupted charge to 100% and the BIOS learn cycle will rewrite its stored profile against the new cell's actual data.
Pavilion 15 shutting down at 20–30% charge shown on screen
This happens when the fuel gauge IC's stored discharge curve no longer matches the cell it is measuring — a common symptom after swapping cells. The gauge predicts 20–30% remaining, but the actual cell voltage has already dropped below the load-sustain threshold under full CPU plus display draw, so the EC triggers an emergency shutdown. The fix is the same calibration cycle: discharge fully to hibernate-cutoff, then charge uninterrupted to 100% without interruption. After two to three full cycles the fuel gauge IC recalibrates its curve against the new cell and the shutdowns stop.