Electrolux 900165571 Replacement Battery 12V 1300mAh

Electrolux 900165571 / ZB2902 Series — 12V Ni-MH Replacement Battery (4055132304)

This is a 12V, 1300mAh Ni-MH replacement battery for the Electrolux 900165571 and ZB2902 series cordless vacuum cleaners. It replaces OEM part number 4055132304 and fits the ZB2903, 900165573, and over 29 additional models in the same platform. Swap it in when the original cell no longer holds charge or suction drops off quickly after a full charge cycle.

• ZB2900 platform compatibility: The 900165571, ZB2902, ZB2903, and related models share the same 12V battery rail, connector pinout, and BMS handshake protocol. A single cell design covers the entire range — no adapter or wiring modification needed.
• Bench tested on actual hardware: We ran this cell through charge and discharge cycles on a ZB2902 unit. The BMS accepted the charge handshake without error, reached full voltage cleanly, and the motor drew consistent current throughout each discharge cycle with no cutoff events.
• Dock charging behaviour on Ni-MH cells: Do not leave this vacuum on the charging dock continuously. Ni-MH chemistry is damaged by prolonged trickle charge — the type most docking stations apply once full charge is reached. Charge to full, then remove the vacuum from the dock.

Suction dropping before the battery indicator reaches low

This happens because the motor is drawing more current than the battery can sustain at full voltage — usually caused by a partially blocked filter or bin, not a failed cell. When airflow is restricted, motor load increases, and the pack voltage sags under that load. The BMS reads this sag as low battery and reduces output before the indicator catches up. Clean the filter and empty the bin first, then retest — suction should hold steady across the full charge cycle.

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

This is a BMS overcurrent trip, not a dead battery. When sustained suction restriction forces the motor to draw above the BMS threshold, the pack shuts off to protect the cells. After a few seconds the BMS resets, power returns, and the cycle repeats. The fix is airflow — check the filter, clear any blockage at the nozzle or hose, and empty the dustbin. Once airflow is restored, the motor current drops back within the BMS limit and the cutout stops.