Compaq Business Notebook 6715b Replacement Battery 10.8V 6600mAh

Compaq Business Notebook 6715b — 10.8V Li-ion Replacement Battery (360483-001)

This 10.8V 6600mAh (71.28Wh) Li-ion battery replaces the original power cell in the Compaq Business Notebook 6715b and a range of HP/Compaq business notebooks from the same era. It uses the same connector, voltage rail, and BMS communication protocol as the factory cell. Fit models include the Business Notebook NX6325, NX6110/CT, NX6140, and over 30 additional variants sharing this platform.

• Shared platform compatibility: The 6715b, NX6325, and NX6110 series all run the same 10.8V three-cell-pair architecture and use an identical SMBus BMS handshake. That shared electrical spec is why one cell fits across this wide model range — the BMS reads voltage, temperature, and cycle count over the same protocol regardless of chassis variant.
• Bench tested on actual hardware: We ran this cell through charge, discharge, and BMS initialisation on the 6715b platform. The BMS authenticated the cell on first connection, accepted a full charge cycle without fault, and reported accurate voltage across the discharge curve. No thermal events or protection trips occurred.
• Post-install discharge cycle: After fitting this battery, run the laptop on battery power until it hibernates at cutoff — do not interrupt it. Then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity and clears the inaccurate health warning that appears after every cell swap on this platform.

BIOS reporting poor battery health immediately after fitting a new cell

The 6715b BIOS reads health data from EEPROM registers embedded in the battery's BMS — not from real-time voltage measurements. When a new cell arrives, those EEPROM values don't match what the BIOS stored from the old cell's last known state. The mismatch triggers a "replace battery" or "poor health" flag even though the new cell is fully functional. Running one complete discharge-to-hibernate then uninterrupted full charge resets the learn cycle and writes fresh baseline data to the BIOS. After one to two full cycles, the health indicator updates to reflect the actual cell condition.

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

This happens when the fuel gauge IC hasn't yet calibrated against the new cell's voltage curve. The OS is reading a State of Charge figure from the old baseline — so when the battery hits a real voltage of around 10.0V under combined CPU and display load, the cell drops off the cliff faster than the gauge expects and the system cuts power before the display can warn you. It is not a fault in the replacement cell. Run two to three full discharge-to-hibernate and full-charge cycles to let the fuel gauge IC recalibrate its coulomb counter against the new cell. After calibration, shutdowns stop and the gauge tracks accurately to the actual cutoff voltage near 9.0–9.6V.