Hasee T58-VC Compatible Battery 14.6V 2750mAh Li-ion

Hasee T58-VC / Z7M-CT7GS Series — 14.6V Li-ion Replacement Battery

This is a 14.6V, 2750mAh (40.15Wh) Li-ion replacement battery for the Hasee T58-VC, Z7M-CT7GS, Z8-CU7NK, G7-CT7NT, and over 35 additional compatible models. It slots into the same bay as the original cell and connects via the same interface. Voltage and chemistry match the OEM spec exactly.

• Multi-model fit across Hasee notebook platforms: The T58-VC, Z7M-CT7GS, Z8-CU7NK, and G7-CT7NT lines share the same 14.6V four-cell architecture, connector pinout, and BMS communication protocol — which is why a single cell unit covers all of them without modification.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on compatible Hasee hardware. The BMS handshake completed without fault codes, charge acceptance was consistent across cycles, and cell voltage held within spec at both low and high draw.
• Post-installation calibration on Hasee notebooks: After fitting this cell, run one full discharge down to hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after any cell swap on Hasee and related OEM platforms.

BIOS reporting poor battery health immediately after fitting a new cell

The BIOS on Hasee notebooks stores learned capacity data from the previous cell in non-volatile memory. When a new cell is fitted, that stored data no longer matches the physical cell, so the firmware flags a health warning before any calibration has run. This is not a fault with the replacement — it is stale EEPROM data from the old battery. Run one full discharge-to-hibernate cycle followed by an uninterrupted charge to 100% to allow the firmware to relearn the cell's actual capacity and clear the warning.

Laptop shuts down with 20–30% charge still shown on screen

This happens when the fuel gauge IC's stored discharge curve no longer matches the new cell's actual voltage-to-capacity profile. The system reads the voltage, maps it to the old curve, and predicts there is charge remaining — but the cell voltage has already dropped below the safe operating floor under CPU and display load. The result is an abrupt shutdown despite a non-zero percentage on screen. Two to three full calibration cycles — full discharge to hibernate, then full charge — rebuild the curve against the new cell and bring the shutdown point back to near 0%.