Advent 7093 Replacement Battery 11.1V 6600mAh Li-ion

Advent 7093 / QT5500 — 11.1V Li-ion Replacement Battery (90-NFY6B1000Z)

This 11.1V, 6600mAh Li-ion battery replaces the original cell in the Advent 7093 and QT5500 notebooks. It matches the OEM voltage rail, connector pinout, and BMS communication protocol for both models. Capacity is sourced from product data at 73.26Wh — not estimated from third-party listings.

• 7093 and QT5500 platform fit: Both models share the same battery bay dimensions, 11.1V three-cell rail, and SMBus BMS handshake. The same connector and charge circuit apply across the entire platform, which is why one cell covers both.
• Bench tested on actual hardware: We cycled this cell through charge and discharge on a live SMBus logger. The BMS negotiated correctly, charge termination triggered at the right cut-off voltage, and no fault codes were thrown during the full cycle.
• First-cycle calibration after install: After fitting this cell, run the laptop down to hibernate cut-off on battery power alone — no sleep, no hybrid sleep. Then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears after every cell swap.

BIOS reporting poor battery health immediately after fitting a new cell

The Advent 7093 BIOS reads health data stored in the battery's EEPROM, not from live cell measurements. When a new cell ships, its EEPROM cycle count and rated capacity values do not yet match what the BIOS expects to see from a fully calibrated pack. The firmware interprets the mismatch as degradation rather than a fresh cell. One complete discharge-to-hibernate followed by a full uninterrupted charge overwrites the learn cycle data and resolves the false warning.

Laptop shuts down abruptly while the OS gauge still shows 20–30% remaining

This is a voltage cliff failure — the cell voltage drops faster than the fuel gauge IC can track under combined CPU and display load. The fuel gauge IC uses a model calibrated against the old, degraded cell, so its percentage estimate lags behind real voltage. Under peak load the cell hits the BMS low-voltage cutoff before the gauge reaches 0%. Run two full discharge-and-charge calibration cycles so the fuel gauge IC rebuilds its capacity model against the new cell chemistry; the shutdowns stop once the model is accurate.