Hasee Z7-DA7NP Replacement Battery 15.4V 3400mAh

Hasee Z7-DA7NP / Z7T Series — 15.4V Li-Polymer Replacement Battery

This 15.4V, 3400mAh (52.36Wh) lithium-polymer cell replaces the original battery in the Hasee Z7-DA7NP, Z7T, Z7-DA7NS, CV15S02, and five additional Z7-series variants. It fits the multi-cell 4S pack configuration these notebooks use to hit the 15.4V rail. Capacity figures come from the product specification, not web estimates.

• Z7-series shared platform: The Z7-DA7NP, Z7T, Z7-DA7NS, and CV15S02 all use the same 4S Li-Polymer pack with a matching connector pinout and BMS handshake protocol. Swapping between these variants does not require any firmware change — the BIOS reads the same cell data across the group.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a Z7-series notebook. The BMS communicated correctly with the BIOS, charge termination triggered at the correct upper voltage, and thermal protection engaged as expected under sustained CPU and display load.
• First-cycle recalibration on Z7-series: After fitting this cell, run one full discharge to the hibernate cutoff, then charge uninterrupted to 100%. The Z7-series BIOS uses this cycle to reset its battery learn data. Skipping it leaves the fuel gauge reading inaccurate for the first several sessions and may trigger a false health warning in the system tray.

Why the Z7-DA7NP BIOS flags poor battery health after a cell swap

The Z7-DA7NP stores cycle count, rated capacity, and health status in the old cell's EEPROM. When you fit a new cell, the BIOS reads fresh EEPROM data that does not match its saved history, so it flags the battery as unknown or degraded. This is not a fault with the replacement cell. Running one complete learn cycle — full discharge to hibernate, then an uninterrupted charge to 100% — lets the BIOS rebuild its internal health record against the new cell's actual data.

Z7-DA7NP shutting down at 20–30% charge shown on screen

This happens when the cell voltage drops sharply under the combined load of the CPU, GPU, and display — the BMS cuts power before the OS-reported percentage reaches zero. The fuel gauge IC has not yet calibrated its discharge curve against the new cell's chemistry. After two or three full discharge-to-hibernate and charge-to-100% cycles, the gauge curve aligns with the actual voltage profile. If the shutdowns continue past three calibration cycles, check that the DC input voltage at the port is holding steady at 19–20V under load.