Hasee W750T Replacement Battery 11.1V 4400mAh Li-ion

Hasee W750T / W740T / W370T — 11.1V Li-ion Replacement Battery

This 11.1V, 4400mAh (48.84Wh) lithium-ion battery fits the Hasee W750T, W740T, and W370T laptops. It replaces the original cell when capacity has dropped or the pack no longer holds a charge. Voltage and connector match the original spec exactly.

• W750T / W740T / W370T platform fit: These three models share the same 11.1V three-cell architecture, battery bay dimensions, and connector pinout — which is why they take an identical pack. The BMS communication protocol is consistent across all three, so the laptop's power controller recognises the replacement without modification.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on a W750T unit. The BMS negotiated correctly with the system board, cell balancing kicked in during the first full charge, and the pack reached rated voltage without thermal event or cutoff fault.
• First-cycle calibration on the W750T: After installing, run one full discharge until the laptop hibernates on its own, 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 battery health as poor immediately after replacement

The W750T BIOS stores cycle count, capacity history, and health data from the previous cell in EEPROM. When a new pack is installed, that stored data doesn't match the fresh cell, so the system flags it as degraded. This is a firmware comparison issue, not a defect in the replacement battery. Run one full discharge-to-hibernate followed by an uninterrupted charge to 100% — this resets the learn cycle and rewrites the health register with accurate data from the new cell.

Laptop shutting down at 20–30% shown on the gauge

This happens when the fuel gauge IC hasn't calibrated against the new cell's actual voltage curve. The gauge was trained on the old, degraded cell and still expects voltage to drop steeply at 30% — so it triggers a low-battery shutdown prematurely. It is not a fault with the replacement pack. Complete two to three full discharge-to-hibernate and uninterrupted charge cycles; the gauge will re-anchor its readings, and shutdowns should stop occurring above 10–15% charge.