About this replacement
HP Compaq 6530b / 6730b Series — 10.8V Li-ion Replacement Battery (HSTNN-IB68)
This is a 10.8V 4400mAh (47.52Wh) Li-ion replacement battery for the HP Compaq 6530b, 6535b, 6730b, and 6735b notebooks. It replaces HP part numbers including HSTNN-IB68, HSTNN-IB69, HSTNN-XB68, and 484786-001. The connector pinout and BMS handshake match the original HP specification for these platforms.
- 6530b / 6535b / 6730b / 6735b platform fit: These four models share the same battery bay dimensions, voltage rail, and SMBus communication protocol. One cell SKU covers all four because HP standardised the BMS handshake across the 65xx and 67xx mobile workstation chassis.
- Bench tested on actual hardware: We ran this cell on a Compaq 6530b and monitored SMBus communication throughout the charge cycle. The BMS reported accurate state-of-charge and accepted the full charge without tripping protection cutoff.
- Post-install calibration on the 6530b: After fitting this cell, run the laptop down to hibernate cutoff on a single discharge, then charge uninterrupted to 100% without interruption. This resets the BIOS battery learn cycle 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 Compaq 6530b BIOS reads cycle count and health data from the battery's EEPROM, not just from live voltage. When a new cell arrives, its EEPROM data does not match the discharge profile the BIOS learned from the old battery. The system flags this mismatch as degraded health even though the cell is new. Running one complete discharge-to-hibernate followed by an uninterrupted charge to 100% writes fresh calibration data and clears the warning on most units.
Laptop shutting down at 20–30% shown on the gauge
This happens when the fuel gauge IC has not yet calibrated against the new cell's actual discharge curve. The IC still holds the old cell's voltage-to-capacity map, so it miscalculates the remaining charge and triggers shutdown before the real capacity is exhausted. It is not a fault with the replacement cell. Run two to three full discharge and charge cycles to allow the fuel gauge IC to remap against the new chemistry — after that, the percentage at shutdown should drop to below 5%.