About this replacement
HP ProBook 440 Series — 10.8V Li-ion Replacement Battery (3ICR19/65-3)
This is a 10.8V, 4400mAh (47.52Wh) Li-ion replacement battery for the HP ProBook 440, 440 G0, 440 G1, and 445 series notebooks. It fits the six-cell bay used across the ProBook 440 line and replaces OEM part numbers including FP06, HSTNN-IB4J, 707616-141, and 708457-001 among others. The cell matches the original voltage rail and connector pinout used on these business-class notebooks.
- ProBook 440 and 445 series fit: The 440, 440 G0, 440 G1, and 445 share the same battery bay geometry, six-pin SMBus connector, and 10.8V nominal voltage rail. That is why one cell covers all four platforms — the BMS handshake protocol and charge termination logic are identical across these generations.
- Bench tested on actual hardware: We ran this cell through charge, discharge, and BMS communication cycles on a ProBook 440 G1. The SMBus dialogue completed correctly, charge termination triggered at the expected voltage, and no fault codes were logged in the battery status register.
- First cycle after install: After fitting this cell, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity — skipping this step leaves the fuel gauge IC working off stale EEPROM data from the old battery.
BIOS reporting battery health as poor immediately after replacement
The ProBook 440 BIOS reads battery health from EEPROM data stored in the battery's fuel gauge IC. When you swap cells, the BIOS compares the new cell's reported state against the old cell's wear history still cached in firmware — the mismatch triggers a false health warning. This is not a fault with the replacement cell. Running one complete discharge-to-hibernate followed by an uninterrupted full charge allows the fuel gauge IC to recalibrate against real cell data, after which the BIOS health flag clears on next boot. If the warning persists past two full cycles, check the battery status in HP Support Assistant against the actual voltage reading — a healthy cell at full charge should read 12.4–12.6V at the terminals.
Laptop shuts down abruptly at 20–30% charge shown on screen
This happens when the cell voltage drops below the BMS cutoff threshold under combined CPU and display load before the OS fuel gauge expects it to. The fuel gauge IC is still using a capacity map built from the degraded original battery, so it reports 25% remaining while the actual cell voltage has already hit the hard cutoff floor. It is a calibration gap, not a faulty replacement. Run two full discharge-to-hibernate and full recharge cycles — the fuel gauge IC will remap its capacity curve against the new cell, and the shutdowns will stop. After calibration, the BMS hard cutoff should not trigger until the cell drops below 9.0V under load.