Hasee F205S Replacement Battery 10.8V 4400mAh 805N00045

Hasee F205S / F440S / F710R Series — 10.8V Li-ion Replacement Battery (805N00045)

This is a 10.8V Li-ion replacement battery rated at 4400mAh (47.52Wh) for Hasee notebook computers. It fits the F205S, F440S, F710R, L208S, and 31 additional models covered under OEM part numbers including 3S4000-G1S2-04, 3S4000-S1P3-04, and WP-UNL50/3. It slots in as a direct swap when the original cell has degraded below usable capacity or failed to hold charge.

• F-series and L-series model coverage: These Hasee notebooks share a 3-cell 10.8V architecture with the same connector pinout and BMS handshake protocol. A single cell SKU covers all listed models because the voltage rail, physical form factor, and communication bus are identical across this product line.
• Bench tested on actual hardware: We cycled this cell on a Hasee F-series chassis and confirmed the BMS negotiated correctly with the notebook EC. The charge controller accepted the cell without fault codes, and thermal monitoring stayed within expected bounds through a full charge cycle.
• Post-install discharge cycle on Hasee notebooks: After fitting this battery, run the laptop on battery power until it drops to hibernate cutoff — do not interrupt it. Then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the false low-health or unknown-state warning that the firmware throws after every cell replacement.

Hasee BIOS reporting poor health or unknown state immediately after fitting a new cell

Hasee notebooks store battery health data in EEPROM on the original cell's circuit board. When you swap in a new cell, the BIOS reads stale or mismatched EEPROM values and flags the battery as degraded or unrecognised — even though the cell is brand new. This is a firmware calibration issue, not a defective battery. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% gives the EC enough data to write fresh values and clear the warning. After two to three cycles, the health indicator in the OS should stabilise at a normal figure.

Laptop shuts down without warning while the OS still shows 20–25% charge remaining

This happens when the cell voltage drops faster than the fuel gauge IC can track under combined CPU and display load. The IC was calibrated against the old, degraded cell and its discharge curve no longer maps correctly to the new chemistry. The laptop reaches the actual low-voltage cutoff threshold before the percentage readout catches up, so shutdown appears sudden. Run two full discharge-to-hibernate cycles without interruption — the fuel gauge IC recalibrates its curve against the new cell, and the remaining percentage will read accurately by the third cycle.