About this replacement
Huawei MateBook / HZ-W19 — 7.6V Li-Polymer Replacement Battery (HB25B7N4EBC)
This is a 7.6V 4300mAh (32.68Wh) lithium-polymer replacement battery for the Huawei MateBook and HZ-W19 laptop. It replaces OEM part number HB25B7N4EBC using the same slim 2.55mm cell profile the chassis requires. Fits the main battery bay without modification.
- MateBook and HZ-W19 compatibility: Both models share the same 7.6V power rail, the same HB25B7N4EBC connector pinout, and the same BMS handshake protocol — one cell fits both without adapter or firmware change.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a MateBook unit. The BMS accepted the cell without fault codes, balanced cells correctly across the pack, and hit the full 32.68Wh rated capacity within three cycles.
- Post-install calibration cycle: After fitting this battery, run the MateBook down to hibernate cutoff — do not force shutdown — then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the false "poor health" or "unknown battery" warning that appears after every cell swap.
BIOS reporting poor battery health immediately after fitting a new cell
The MateBook's BIOS stores charge history and health data in EEPROM tied to the original cell. When a new cell goes in, that old data stays — the BIOS reads it and flags a health warning even though the cell is new. This is not a fault with the replacement. Run one full discharge-to-hibernate followed by an uninterrupted charge to 100%. After one or two cycles, the BIOS learn cycle rewrites the EEPROM data against the new cell and the warning clears.
MateBook shutting down at 20–30% charge shown on screen
This happens when the cell voltage drops sharply under full CPU and display load — the fuel gauge still reads 20–30% by percentage, but the cell cannot hold voltage above the BMS cutoff threshold at that draw level. It is a voltage cliff: the cell hits cutoff before the percentage counter reaches zero. The fix is calibration — discharge fully to hibernate, not a forced shutdown, then charge to 100% without interruption. After two or three calibration cycles, the fuel gauge IC maps the new cell's voltage curve accurately and the early shutdowns stop.