Advent 7002 Replacement Battery 11.1V 6600mAh Li-ion

Advent 7002 / 7004 / 7005 / 7006 Series — 11.1V Li-ion Replacement Battery (7004)

This is an 11.1V, 6600mAh (73.26Wh) Li-ion replacement battery for Advent notebook computers in the 7002, 7004, 7005, and 7006 series. It replaces OEM part numbers 7004, 7005, 7006, 7170, 8170, 8175, 442671200001, 442671200002, and 442671200005. When the original cell no longer holds a charge or fails to power the notebook off AC, this cell slots in directly.

• 7002 / 7004 / 7005 / 7006 compatibility: These Advent notebook models share the same battery bay dimensions, 11.1V power rail, and connector pinout — which is why a single cell covers all four. The BMS communicates over the same SMBus line across the series, so health data passes to the OS without modification.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on an Advent-class notebook and monitored BMS communication throughout. The protection circuit tripped correctly at low-cell-voltage cutoff, and charge termination triggered cleanly at full capacity.
• First-cycle recalibration on the Advent 7002: After fitting this cell, run the notebook off battery until it hibernates from low charge, then charge uninterrupted to 100% without interruption. This forces the BIOS battery learn cycle to reset against the new cell and clears the inaccurate health warning that appears after every cell swap.

Why the Advent 7002 shuts down at 20–30% remaining after a battery swap

The Advent's fuel gauge IC builds a discharge model from the cell it calibrated against originally. A new cell has different internal resistance and a steeper voltage curve at the bottom of the charge range. Under combined CPU and display load, voltage drops faster than the old model predicts, and the notebook shuts off before the gauge reads zero. Running two or three full discharge-to-hibernate and full-charge cycles gives the fuel gauge IC enough data to recalibrate against the new cell's actual curve. After calibration, shutdown at false-high percentages stops.

BIOS reporting the replacement battery as poor health or unknown immediately after fitting

The BIOS reads health status from EEPROM data written by the original cell — cycle count, rated capacity, and charge history. A brand-new cell presents fresh EEPROM values that don't match the ageing profile the BIOS expects, so it flags the battery as degraded or unrecognised. This is a data mismatch, not a fault with the cell. Run one complete discharge-to-hibernate cycle followed by an uninterrupted charge to 100%; the BIOS learn cycle will rewrite the health register and the warning clears.