Ambrogio Robby 14.4V Ni-MH Replacement Battery 4000mAh

Ambrogio Robby / Robby Deluxe / Robby Home XR — 14.4V Ni-MH Replacement Battery

This is a 14.4V, 4000mAh Ni-MH replacement battery for the Ambrogio Robby, Robby Deluxe, and Robby Home XR robotic vacuum cleaners. It slots into the same bay as the original cell and reconnects to the same BMS circuit. Capacity is sourced from the product specification at 4000mAh (57.6Wh).

• Robby, Robby Deluxe, and Robby Home XR compatibility: All three models run the same 14.4V power rail, share the same connector housing, and communicate with the same BMS logic — which is why one cell fits all three variants without modification.
• Bench tested on actual hardware: We ran this cell through full charge-discharge cycles and monitored the BMS response under simulated motor-load conditions. The protection circuit triggered correctly at both the high-voltage cutoff and the low-voltage floor, with no false trips during steady draw.
• Dock charging habit on the Robby series: These robots default to sitting on the dock between cleans. Ni-MH cells on continuous trickle charge develop capacity fade faster than cells charged only when depleted. Charge to full, then remove the unit from the dock until the next scheduled run.

Suction dropping before the battery indicator reaches low on the Robby

Ni-MH cells show a relatively flat discharge curve until voltage collapses quickly near the end of charge. On the Robby, the motor is the largest current draw, and a partially restricted filter forces it to pull harder — accelerating the voltage sag point. The result is noticeable suction loss well before the indicator flags a low-battery condition. Clean or replace the filter first. If suction recovers, the battery is not the cause.

Motor cuts out mid-clean and restarts after a few seconds

This is a BMS overcurrent trip, not a mechanical fault. When the filter is blocked or the brush roll is jammed, motor current spikes above the BMS threshold and the protection circuit opens. The cell cools, the BMS resets, and the motor restarts — then trips again if the restriction is still present. Clear the brush roll and check the filter for buildup. If trips stop after that, the battery and BMS are functioning correctly.