HP HSTNN-LB4P 11.1V Laptop Replacement Battery 4500mAh

hp HSTNN-LB4P — 11.1V Li-Polymer Replacement Battery (TPN-C109 / TPN-C110 / TPN-C111)

This is an 11.1V, 4500mAh (49.95Wh) Li-Polymer replacement battery for hp notebook computers cross-referenced to OEM part numbers HSTNN-LB4P, TPN-C109, TPN-C110, TPN-C111, 714762-421, 714762-2C1, and 715050-001. It restores battery operation to hp laptops whose original cells have failed or degraded past usable capacity. Confirm your OEM part number on the original battery label before ordering.

• TPN-C109 / TPN-C110 / TPN-C111 platform: These three part numbers share the same physical connector, cell voltage rail, and BMS handshake protocol across the hp notebook lines they serve — that is why one cell covers all three. The EEPROM on this replacement is written to match the rated chemistry, so the BIOS negotiates correctly on first boot.
• Bench tested on actual hardware: We cycled this cell through full charge-to-discharge sequences and monitored BMS cutoff thresholds. The protection circuit tripped cleanly at the low-voltage floor and accepted a trickle-charge re-entry without requiring a manual reset.
• Post-install calibration tip: After fitting this battery, 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 almost always appears after a cell swap on hp notebooks.

BIOS reporting battery health as poor immediately after replacement

The hp BIOS reads health data stored in the battery's EEPROM and compares it against a learned baseline from the old cell. When a new cell arrives, that baseline is blank or mismatched, so the BIOS flags the battery as degraded before it has run a single cycle. This is a firmware artefact, not a fault with the replacement cell. Run one full discharge-to-hibernate then a complete uninterrupted charge to 100% — the BIOS resets its learn cycle against the new chemistry and the warning clears.

Laptop shuts down abruptly at 20–30% charge shown on screen

This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The displayed percentage is based on the old cell's profile, so the gauge reads 25% while the real cell voltage has already dropped below the BMS cutoff under combined CPU and display load. The fix is calibration, not another battery swap. Discharge fully to hibernate-cutoff, charge to 100% without interruption, and repeat for two to three cycles — the fuel gauge IC maps the new voltage curve and the premature shutdowns stop.