Advent 7093 Replacement Battery 11.1V 4400mAh Li-ion

Advent 7093 / QT5500 — 11.1V Li-ion Replacement Battery

This is an 11.1V 4400mAh (48.84Wh) Li-ion replacement battery for the Advent 7093 and QT5500 notebooks. It slots into the original bay and connects via the factory battery connector. When the original cell can no longer hold charge through a full work session, this cell restores portable operation.

• 7093 and QT5500 compatibility: Both models share the same battery bay geometry, connector pinout, and 11.1V three-cell series configuration. The BMS communication protocol is identical across the two, so a single cell revision covers both platforms without adapter or modification.
• Bench tested on actual hardware: We cycled this cell through charge and full discharge on a 7093 unit. The BMS completed charge handshake without fault codes, held stable voltage through mid-cycle load steps, and triggered low-battery hibernate at the correct threshold.
• First-install discharge cycle: After fitting this cell, run the laptop on battery from 100% down to automatic hibernate cutoff, then charge uninterrupted back to 100%. This one full cycle 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 BIOS on these Advent notebooks reads health data from EEPROM registers carried over from the old cell's charge history. When a new cell is fitted, those registers still reflect the degraded state of the previous pack. The laptop has no automatic way to know it is now reading a fresh cell. Running one complete discharge-to-hibernate followed by a full uninterrupted charge gives the BIOS enough cycle data to update its health register and clear the warning.

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

This is a voltage cliff issue, not a faulty cell. Under combined CPU and display load, cell voltage drops faster than the fuel gauge IC can track, and the pack hits the BMS low-voltage cutoff while the OS still shows 20–30% remaining. The fuel gauge IC needs two or three full calibration cycles against the new cell before its discharge curve model becomes accurate. Run three full discharges to hibernate cutoff and full recharges — the shutdown point will move down to match actual cell capacity.