About this replacement
HP 250 G7 / 255 G7 — 11.55V Li-Polymer Replacement Battery (HT03XL)
This is an 11.55V, 3550mAh (41Wh) Li-Polymer replacement battery for the HP 250 G7 and 255 G7 notebooks. It also fits the HP 15-CS and 17-BY series, along with over 270 additional HP notebook models sharing the same HT03XL platform. Cross-reference OEM part numbers include L11119-855, HSTNN-LB8M, and TPN-I130 through TPN-I134 before ordering.
- 250 G7 / 255 G7 platform compatibility: These models share the same three-cell Li-Polymer pack format, connector pinout, and BMS handshake protocol. The 11.55V nominal rail is dictated by the HP charging IC on this platform — swapping to a different voltage pack will trip the controller and prevent charging entirely.
- Bench tested on actual hardware: We ran this cell through the full HP charge cycle on a 250 G7 unit. The BMS negotiated correctly with the EC firmware, charge current stepped down normally at the 90% threshold, and the pack reached full charge without fault codes.
- Post-install discharge cycle on the 250 G7: After fitting this battery, run the laptop on battery only until it hibernates at low-charge cutoff, then charge uninterrupted to 100%. This forces the 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.
BIOS reporting poor battery health immediately after fitting the HT03XL
HP's EC firmware stores historical charge data from the previous cell in EEPROM. When a new pack is installed, the BIOS compares actual charge acceptance against that stale data and flags the battery as degraded before any real measurement has occurred. This is not a fault with the replacement cell. Run one full discharge-to-hibernate followed by an uninterrupted charge to 100% — this overwrites the EEPROM baseline and the health warning clears on the next boot.
HP 250 G7 shutting down at 20–30% battery shown on screen
This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The gauge maps a voltage reading to a percentage using the old cell's profile — the new cell hits a voltage cliff at a different point, so the laptop loses power well before the display reads zero. It is not a defective battery. Run two to three full discharge and charge cycles without interrupting them, and the fuel gauge IC re-learns the correct curve. After calibration, shutdown should not occur above 5% remaining.