Mitac MiNote 8889 11.1V Replacement Battery BP-8889

Mitac MiNote 8889 / 8389 / 8089 Series — 11.1V Li-ion Replacement Battery (BP-8889)

This 11.1V, 6600mAh (73.26Wh) Li-ion battery replaces the original cell in the Mitac MiNote 8889, 8389, and 8089 series notebooks. It fits the original battery bay without modification and connects via the factory connector. Install it when the original cell no longer holds a charge or the laptop dies unexpectedly under load.

• MiNote 8089, 8089P, 8389, and 8889 compatibility: These models share a common 11.1V three-cell architecture, the same connector pinout, and the same BMS communication protocol — one cell fits all four platforms without adapter or firmware change.
• Bench tested on actual hardware: We cycled this cell through full charge and discharge on the MiNote platform. The BMS handshake cleared without error codes, charge acceptance held steady across cycles, and the protection circuit tripped correctly at the low-voltage cutoff threshold.
• Post-install discharge cycle: After fitting this cell, run one full discharge to hibernate cutoff, 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.

BIOS reporting poor battery health immediately after fitting a new cell

The MiNote BIOS reads health data from EEPROM registers embedded in the battery's fuel gauge IC. When you swap cells, those registers still hold wear data from the old pack. The BIOS flags the battery as degraded because it is comparing current readings against a stale baseline. Running one full discharge-to-hibernate, followed by a complete uninterrupted charge, rewrites the learn cycle data and aligns the BIOS health report with the new cell's actual state.

MiNote shutting down at 20–30% charge shown on screen

This happens when the cell cannot sustain voltage under simultaneous CPU and display load — the terminal voltage drops below the BMS cutoff threshold before the fuel gauge reaches zero. On the MiNote platform, this is almost always a calibration gap, not a faulty cell. The fuel gauge IC mapped its capacity curve against the old degraded cell and is now misreading the discharge slope on the new one. Run two full calibration cycles — full discharge to hibernate cutoff, full charge to 100% — and the fuel gauge recalibrates its curve to the new cell's actual 73.26Wh capacity.