RoboJet Air 14.4V Ni-MH Replacement Battery 2500mAh

RoboJet Air — 14.4V Ni-MH Replacement Battery

This is a 14.4V, 2500mAh Ni-MH replacement battery for the RoboJet Air robotic vacuum cleaner. It replaces the original cell pack that powers the drive motors and suction mechanism. When the stock battery loses capacity after repeated cycles, this cell restores the unit to operation.

• RoboJet Air platform fit: The Air series runs a 14.4V rail across both the drive and suction motor circuits. This pack matches that voltage rail and the physical connector configuration used on the Air platform.
• Bench tested on actual hardware: We cycled this pack through charge and discharge on the RoboJet Air chassis. The BMS handled motor-start inrush current without tripping, and voltage held stable across both low-pile and carpet surface simulations.
• Dock charging behaviour on Ni-MH: Do not leave the RoboJet Air sitting on its charging dock indefinitely. Ni-MH cells are more sensitive to continuous trickle charge than Li-ion — permanent dock parking accelerates capacity fade faster than normal cycle wear. Charge to full and remove the unit from the dock.

Suction dropping before the battery indicator reaches low

This is one of the most common complaints on the RoboJet Air, and it is rarely a dead battery. When the filter is partially blocked, the suction motor works harder to maintain airflow and draws more current than rated. The battery voltage sags under that elevated draw, and the motor loses power even though the indicator still reads mid-charge. Clean or replace the filter first — if suction recovers, the battery is not the fault. If voltage still sags on a clean filter and a fresh charge, the cell pack is degraded and needs replacement.

RoboJet Air motor cutting out mid-clean and then recovering

This cut-and-recover pattern points to the BMS tripping on an overcurrent event rather than the battery being fully discharged. It typically happens when the suction path is restricted — a blocked filter or tangled brush roll forces the motor to pull a sustained current spike that the BMS reads as a fault condition. The BMS shuts output, cools, and resets — which is why the vacuum restarts after a short pause. Clear the brush roll and filter, then recharge to full (14.4V at the pack terminals) before running another cycle.