About this replacement
HP Pavilion 11-S001TU Series — 7.6V Li-ion Replacement Battery (PP02XL)
This is a 7.6V, 4750mAh (36.1Wh) Li-ion replacement battery for the HP Pavilion 11-S001TU, 11-S002TU, and 11-S003TU notebooks. It matches the original PP02XL cell format, connector, and BMS communication protocol. Drop voltage or capacity mismatches cause charging refusal — this cell avoids both.
- Pavilion 11-S series compatibility: The S001TU, S002TU, and S003TU share the same 7.6V battery rail, TPN-Q166 board designation, and four-pin SMBus connector. Any cell deviating from these specs will trip the charge controller and refuse to charge.
- Bench tested on actual hardware: We ran this cell on a Pavilion 11-S unit and monitored BMS handshake, charge acceptance, and cutoff thresholds. The controller recognised the cell immediately, charged to full without interruption, and hit the expected 8.4V peak before taper.
- Post-install calibration on the Pavilion 11-S: After fitting this battery, run the laptop on battery only until it reaches hibernate cutoff — do not interrupt it. Then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the false "poor health" warning that appears after any cell swap on this platform.
Pavilion 11-S shutting down at 20–30% shown after battery swap
This happens because the fuel gauge IC is still calibrated to the old cell's discharge curve. The new cell has different internal resistance, so the voltage drops faster under combined CPU and display load than the gauge predicts. The controller reads voltage and concludes the pack is near empty — even when the percentage shown says otherwise. Running two full discharge-to-hibernate cycles recalibrates the IC against the new cell and brings the reported percentage back in line with actual voltage.
BIOS reporting wrong Wh rating after fitting the PP02XL
The Wh figure shown in BIOS or Windows Battery Report is pulled from the cell's EEPROM, not measured live. Some PP02XL-compatible cells carry EEPROM data reflecting the OEM rated value rather than the actual chemistry capacity of the replacement cell. This is a data mismatch, not a fault. Check the live "Full Charge Capacity" value in Windows — open PowerShell and run powercfg /batteryreport, then look at the HTML report for the FULL CHARGE CAPACITY column to confirm the cell is charging to its actual 36.1Wh.