About this replacement
HP Pavilion 11 / Pavilion Touchsmart 11 Series — 11.1V Li-ion Replacement Battery (KP03 / 729892-001)
This is an 11.1V, 2200mAh (24.42Wh) Li-ion cell for the HP Pavilion 11 and Pavilion Touchsmart 11 notebook range. It covers the standard Pavilion 11, Touchsmart 11-E, and 11-E000 sub-series, along with a wide spread of OEM part numbers including HSTNN-DB5P, HSTNN-YB5P, and TPN-C112. Install it when the original cell no longer holds a usable charge or fails to register with the BIOS.
- Pavilion 11 and Touchsmart 11 series fit: These models share the same 11.1V three-cell bus, connector pinout, and BMS handshake protocol. The BIOS negotiates charge authority with the cell over the SMBus line — the connector and communication layer here match what HP built into the Pavilion 11 board revision.
- Bench tested on actual hardware: We cycled this cell on a Pavilion 11 board and confirmed the BMS accepted the EEPROM data without fault codes. Charge current ramped correctly from CC to CV, and the cell held voltage above the BMS low-cutoff threshold through full discharge.
- First-cycle calibration on Pavilion 11: After fitting, run the laptop off battery power until it hibernates on empty — do not interrupt. Then charge to 100% without unplugging mid-cycle. This lets the BIOS fuel gauge IC re-learn the cell's actual capacity curve and clears the false "poor battery health" warning that appears after every cell swap.
BIOS reporting battery health as poor immediately after fitting a new cell
The HP Pavilion 11 BIOS reads health data stored in the cell's EEPROM and compares it against its own logged discharge history. A new cell arrives with factory EEPROM values that don't match the board's accumulated charge cycle data — the mismatch triggers a health warning even though the cell is new. This is not a fault with the replacement cell. Run one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100%, and the BIOS learn cycle will overwrite the stale data. After two to three calibration cycles, the health status normalises.
Pavilion 11 shutting down at 20–30% charge shown on screen
This happens when the fuel gauge IC still holds calibration data from the old, degraded cell. Under full CPU and display load, the new cell's actual voltage-versus-capacity curve doesn't match the stored model — the system reads the voltage drop as critically low and triggers an emergency shutdown. The gauge isn't wrong about voltage; it's wrong about where that voltage sits on the charge curve. Run two complete discharge-to-hibernate then full-charge cycles, and the fuel gauge IC will re-map its model against the new cell — shutdowns at false percentages stop once calibration completes.