Fujitsu Amilo K7600 Replacement Battery 11.1V 6600mAh

Fujitsu Amilo K7600 — 11.1V Li-ion Replacement Battery (442677000001)

This is an 11.1V, 6600mAh (73.26Wh) lithium-ion replacement battery for the Fujitsu Amilo K7600 notebook. It slots into the existing battery bay and connects through the original multi-pin interface. Voltage, connector pin-out, and BMS communication match the factory specification for this model.

• Amilo K7600 compatibility: This battery covers the broad OEM cross-reference pool for the K7600 platform — including 442677000003, 442677000004, BP-8389, BP-8889, and BT.T3007.003. All share the same 11.1V rail, physical form factor, and BMS handshake protocol required by the Amilo K7600 charge controller.
• Bench tested on actual hardware: We cycled this cell through charge and discharge under CPU-plus-display load. The BMS held voltage above the low-cell cutoff threshold throughout and did not trigger a premature shutdown event. Charge termination occurred cleanly at full cell capacity.
• First-cycle learn reset on the K7600: After fitting, run the laptop on battery until it hibernates on low-cell cutoff, then charge uninterrupted to 100% without unplugging mid-cycle. This forces the BIOS battery learn cycle to recalibrate against the new cell and clears the inaccurate health warning that appears after every cell swap on this platform.

BIOS reporting poor battery health immediately after fitting a new cell

The Amilo K7600 BIOS reads health data stored in the battery's EEPROM on first connection. A new cell carries factory EEPROM values that do not match the charge history the BIOS expects, so it flags the battery as degraded before a single cycle has run. This is a calibration state, not a fault. Running one full discharge-to-hibernate followed by an uninterrupted charge to 100% resets the learn cycle. After two to three full cycles, the BIOS health reading normalises.

Laptop shuts down abruptly at 20–30% charge shown on the fuel gauge

This happens when the fuel gauge IC has not yet mapped the new cell's discharge curve. The gauge reads voltage against the old cell's profile, so it reports 20–30% remaining at a point where the actual cell voltage is already near cutoff under full CPU and display load. The BMS then trips the protection circuit to prevent deep discharge — the shutdown is correct behaviour, but the displayed percentage is wrong. Complete two full discharge-and-charge cycles without interruption and the fuel gauge IC recalibrates its state-of-charge model against the new cell. After that, shutdown should occur below 5% indicated.