Electrolux AG406 Replacement Battery 7.2V 2000mAh Ni-MH

Electrolux AG406 / ZB4106 Series — 7.2V Ni-MH Replacement Battery (90005510600)

This is a 7.2V, 2000mAh Ni-MH replacement battery for the Electrolux AG406 and ZB4106 series cordless handheld vacuums. It replaces OEM part numbers 90005510600, 90016553200, 90016584800, and 90016585000. Fit models include the AG406, ZB406WD, ZB4106, and ZB4106WD.

• AG406 and ZB4106 series compatibility: These models share the same 7.2V battery rail, connector footprint, and cell configuration. One replacement covers the full range without modification.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on the AG406 platform. The BMS responded correctly to the charger handshake, accepted a full charge without error, and released current to the motor without tripping.
• Dock charging habit on AG406 vacuums: Do not leave this vacuum sitting on the charging dock permanently. Ni-MH cells in this unit are vulnerable to trickle charge damage from continuous dock contact. Charge to full, then remove the vacuum from the dock until the next use.

Suction dropping before the battery indicator reaches low on the AG406

The AG406 motor draws more current when airflow is restricted — a partially clogged filter forces the motor to work harder against the blockage. Under that extra load, a degraded or partially charged Ni-MH cell sags in voltage before the indicator registers a low state. The motor slows, suction drops, but the battery light stays green. Clean the filter first. If suction recovers immediately, the battery was compensating for a restriction, not failing on its own.

Motor cuts out mid-use then recovers after a few seconds

This is a BMS overcurrent trip, not a dead battery. It happens when the motor draws a sustained high current — usually from a blocked filter or a debris jam at the nozzle. The BMS interprets that current spike as a fault and cuts output to protect the cell. It resets after a short thermal or time delay, which is why the vacuum comes back on its own. Clear the blockage, then confirm the cell is at or above 7.2V resting voltage before ruling out a battery fault.