About this replacement
Rowenta AC861901/2D0 & AC862901/2D0 — 9.6V Ni-MH Replacement Battery (RS-AC3351)
This is a 9.6V, 2000mAh Ni-MH replacement battery for the Rowenta AC861901/2D0 and AC862901/2D0 cordless vacuum cleaners. It matches the OEM part number RS-AC3351 and slots into the original battery bay. Capacity figures are from product data — 19.2Wh total energy.
- AC861901/2D0 and AC862901/2D0 platform: Both models share the same 9.6V motor rail, connector pinout, and BMS handshake requirements. A single cell pack covers both without modification.
- Bench tested on actual hardware: We cycled this pack through charge and load discharge on the AC861901 motor controller. The BMS accepted charge within normal parameters and held the voltage rail stable under simulated carpet-load draw.
- Dock charging discipline: Do not leave this vacuum sitting on the charging dock indefinitely. Ni-MH cells on continuous trickle charge develop capacity fade faster than those charged only when depleted. Charge to full, then remove from dock.
Cordless vacuum losing suction before the battery indicator reaches low
This is a motor voltage sag issue, not a dead battery. When the filter is partially blocked, the motor draws more current than rated to maintain airflow. That elevated draw pulls the pack voltage down earlier than the indicator expects. The indicator reads state of charge, not motor load — so it lags behind real-world depletion. Clean or replace the filter first and retest before concluding the battery is at fault.
Motor cutting out mid-clean then recovering after a short pause
This is a BMS overcurrent trip, not a faulty battery or motor. Sustained restricted airflow — caused by a clogged filter or blocked nozzle — forces the motor to pull current beyond the BMS threshold. The BMS cuts power to protect the cells, then resets after the pack cools slightly. Clear the blockage, confirm the filter is clean, then restart. If cutouts continue on a clear filter, check pack voltage under load — it should hold above 8.4V during normal operation.