Mamibot Sweepur 120 Replacement Battery 7.2V 2000mAh

Mamibot Sweepur 120 — 7.2V Ni-MH Replacement Battery (180615)

This is a 7.2V, 2000mAh Ni-MH replacement battery for the Mamibot Sweepur 120 robot vacuum cleaner. It matches OEM part number 180615 and slots into the same bay as the original cell. Capacity is rated at 14.4Wh — identical to the factory-fitted unit.

• Sweepur 120 compatibility: The Sweepur 120 uses a 7.2V Ni-MH pack to drive both the main motor and the navigation board from a single cell block. Voltage and connector must match exactly — substituting a Li-ion pack at this voltage rail will cause a BMS handshake fault and the unit will not run.
• Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the Sweepur 120 platform. The BMS accepted the pack without fault codes, and the motor drew steady current across hard floor and low-pile carpet passes.
• Dock charging behaviour on Sweepur 120: Do not leave the Sweepur 120 sitting on its dock between cleans. This model applies a continuous trickle charge when docked, which degrades Ni-MH cells faster than Li-ion tolerates it. Charge to full, then remove from the dock until the next clean cycle.

Cordless vacuum losing suction before the battery indicator reaches low

This happens when the main motor draws more current than the battery can sustain at full voltage — the pack voltage sags under load even though stored charge remains. On the Sweepur 120, a partially blocked filter is the most common trigger: restricted airflow forces the motor to work harder, pulling amps the ageing cell cannot deliver cleanly. The result is reduced suction output well before the low-battery warning fires. Clean or replace the filter first, then retest — if suction recovers and holds, the battery is not the root cause.

Motor cuts out mid-clean then restarts after a short pause

This is a BMS overcurrent trip, not a flat battery. When suction is restricted — by a clogged filter, tangled brush roll, or blocked inlet — the motor draws a sustained spike above the BMS current limit and the pack shuts output to protect the cell. After a short cool-down, the BMS resets and the motor restarts. Check the brush roll for hair wrap and clear the filter before assuming the battery is faulty. If cut-outs persist on a clean, unobstructed machine, measure resting pack voltage — a healthy Ni-MH cell at full charge should read at or above 8.5V.