Overmax Aspiri Robo 14.4V Replacement Battery INR18650-4S1P

Overmax Aspiri Robo — 14.4V Li-ion Replacement Battery (INR18650-4S1P)

This is a 14.4V, 2600mAh Li-ion replacement battery pack for the Overmax Aspiri Robo robotic vacuum cleaner. It uses a 4S1P cell configuration — four 18650 cells wired in series — to match the voltage rail the Aspiri Robo's motor and navigation systems require. Slot it in when the original pack no longer carries the unit through a full cleaning cycle.

• Aspiri Robo voltage match: The Aspiri Robo's drive motor, suction motor, and onboard navigation all run from the same 14.4V bus. A 4S1P pack delivers that voltage with a full-charge ceiling of approximately 16.8V and a BMS cutoff near 12V, which is exactly what the factory electronics expect.
• Bench tested on actual hardware: We cycled this pack through repeated charge and discharge passes on the Aspiri Robo platform. The BMS handled motor-start inrush without tripping and maintained stable voltage output across both suction and drive loads simultaneously.
• Dock charging on the Aspiri Robo: Do not leave the Aspiri Robo sitting on the charging dock permanently. Continuous trickle current through a Li-ion pack accelerates capacity fade. Charge to full, then remove the unit from the dock until the next use.

Suction dropping before the battery indicator reaches low

This happens when the suction motor is working against a partial blockage or a clogged filter. Restricted airflow forces the motor to draw more current than rated, which pulls the pack voltage down faster than the indicator circuit expects. The result looks like a weak battery, but the actual cause is elevated motor load. Clear the filter and check the dustbin inlet before assuming the pack is at fault.

Motor cutting out mid-run then recovering after a short pause

This is a BMS overcurrent trip, not a dead cell. When the suction path is restricted — blocked brush roll, full dustbin, or a saturated filter — the motor draws a sustained current spike the BMS interprets as a fault condition. It disconnects the output, the unit pauses, the BMS resets, and the motor restarts. Clean the filter and brush roll completely, then confirm the pack rests at 16.4V or above after a full charge before running again.