About this replacement
HP ProBook 4730s / 4740s — 14.4V Li-ion Replacement Battery (633734-141)
This is a 14.4V, 4400mAh (63.36Wh) Li-ion battery for the HP ProBook 4730s and ProBook 4740s. It replaces OEM part numbers including 633734-141, 633807-001, HSTNN-IB2S, and PR08. Both ProBook models share the same voltage rail, connector pinout, and BMS handshake protocol — one cell fits both.
- ProBook 4730s and 4740s compatibility: HP used the same battery bay geometry, 14.4V rail, and SMBus communication protocol across the 4730s and 4740s chassis. The BMS on both models reads cell data over the same SMBus interface, so one replacement cell negotiates correctly with both platforms without modification.
- Bench tested on actual hardware: We ran this cell on a ProBook 4730s under mixed CPU and display load. The BMS completed charge negotiation without fault codes, balanced across all cells through the full charge cycle, and held voltage above the low-battery threshold until hibernate cutoff.
- Post-install calibration on the ProBook 4730s: After fitting this cell, run one full discharge to hibernate cutoff — do not manually power off — 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.
Why the ProBook 4730s shuts down at 20–30% remaining
The ProBook 4730s fuel gauge IC calibrates its low-battery threshold against data stored in the original cell's EEPROM. When a new cell is installed, that stored data no longer matches actual cell chemistry, so the IC triggers shutdown well above true depletion. The fix is a calibration cycle: discharge fully to hibernate cutoff, then charge to 100% without interruption. After two to three full cycles, the fuel gauge IC re-learns the new cell's voltage curve and cutoff shifts back to the correct threshold.
BIOS reporting battery health as "poor" immediately after replacement
The HP BIOS reads cycle count, rated capacity, and health status directly from the EEPROM on the old cell. A new replacement cell ships with a fresh EEPROM profile that does not match the values the BIOS cached from the original battery, triggering the health warning even on a brand-new cell. This is a data mismatch, not a cell fault. Run one full discharge-to-hibernate then uninterrupted charge-to-100% sequence — the BIOS re-reads the EEPROM on the next boot and clears the warning once the learn cycle completes.