ROBOT RBC003 Cordless Vacuum Replacement Battery 14.4V 3500mAh

ROBOT RBC003 / RBC006 / RBC009 / RBC011 — 14.4V Ni-MH Replacement Battery

This is a 14.4V 3500mAh Ni-MH replacement battery for the ROBOT RBC003, RBC006, RBC009, and RBC011 cordless vacuum cleaners. It slots into the battery compartment and powers both the suction motor and brush drive. When the original cell can no longer hold a useful charge, this replacement restores full operating voltage to the vacuum.

• RBC series compatibility: The RBC003, RBC006, RBC009, and RBC011 all run the same 14.4V battery platform with a shared connector and matching BMS voltage thresholds — that is why one cell covers the range.
• Bench tested on actual hardware: We cycled this cell through full discharge and recharge on a 14.4V Ni-MH test rig. The BMS held cutoff correctly at low voltage and the cell recovered charge without error flags across multiple cycles.
• Dock charging habit on the RBC series: Do not leave the vacuum sitting on the charging dock permanently. These Ni-MH cells develop capacity fade significantly faster under continuous trickle charge. Charge to full and remove from the dock — reconnect only when the vacuum needs another charge.

Suction dropping before the battery indicator reaches low

Ni-MH cells under motor load show a voltage sag that the indicator circuit does not always catch in real time. When the filter is partially blocked, the motor draws more current than rated, pulling cell voltage down faster than the indicator reflects. The vacuum loses suction noticeably while the light still reads mid-charge. Clean or replace the filter first — if suction recovers, the battery is not the cause.

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

This is a BMS overcurrent trip, not a battery failure. Sustained restricted airflow — usually a clogged filter or brush roll jam — forces the motor to draw beyond the BMS current limit, which cuts power to protect the cell. The BMS resets after a short thermal delay, which is why the vacuum restarts on its own. Clear the blockage and verify brush roll spin is unobstructed before assuming the battery is at fault.