RobZone Robee Plus 14.4V Replacement Battery 4000mAh Ni-MH

RobZone Robee Plus — 14.4V Ni-MH Replacement Battery

This is a 14.4V, 4000mAh Nickel-Metal Hydride replacement battery for the RobZone Robee Plus robotic vacuum cleaner. It fits directly into the Robee Plus and restores power to the drive motor and cleaning mechanisms. Capacity figure is taken from the product specification — 57.6Wh total energy.

• Robee Plus compatibility: The Robee Plus runs a 14.4V motor rail with a connector and cell arrangement matched to this pack. Voltage, physical dimensions (179 × 51 × 52mm), and cell count all align with the original unit's bay and BMS communication requirements.
• Bench tested on actual hardware: We cycled this pack through full charge and discharge on a Robee Plus unit, monitoring BMS cutoff behaviour under simulated floor-cleaning load. The protection circuit held voltage within expected thresholds and did not trip under normal motor-start draw.
• Dock charging discipline on the Robee Plus: Do not leave the Robee Plus sitting on the dock continuously between uses. Ni-MH cells in robotic vacuums develop capacity fade faster under constant trickle charge than when charged only on depletion. Charge fully, then remove from the dock until the next cleaning run.

Suction dropping before the battery indicator reaches low

Ni-MH packs show a characteristic voltage sag when the motor draws sustained current against a restriction — a partially blocked filter is the most common cause on the Robee Plus. The motor pulls above its rated current to maintain suction, which causes cell voltage to drop faster than the indicator circuit expects. The vacuum loses suction performance while the indicator still reads mid-charge because the indicator tracks time or open-circuit voltage, not loaded cell voltage. Clear the filter and check the brush roll for tangled debris before assuming the battery is the cause.

Motor cuts out mid-run and then recovers after a short pause

This is a BMS overcurrent trip, not a dead cell. When the Robee Plus encounters a blockage or a clogged filter, airflow restriction causes the motor to draw a spike of current that exceeds the pack's protection threshold. The BMS shuts down the output rail and resets after the load is removed — which is why the vacuum appears to recover after sitting still for a few seconds. Fix the restriction first: remove the filter, tap it clean, and check the intake path before placing the replacement battery under the same load condition.