MH1-4S2P-300S Cecotec Conga 5090 Compatible Battery 14.8V 6700mAh

Cecotec Conga 5090 / 6090 / 7090 Series — 14.8V Li-ion Replacement Battery (MH1-4S2P-300S)

This is a 14.8V 6700mAh Li-ion replacement battery for the Cecotec Conga robotic vacuum range. It fits the Conga 5090, 5490, 6090, and 7090 models. The OEM part number is MH1-4S2P-300S.

• Conga 5090, 5490, 6090, and 7090 compatibility: These four models share the same 14.8V battery platform, connector pinout, and BMS communication protocol. One cell pack covers all four without modification.
• Bench tested on actual hardware: We ran this battery through charge and discharge cycles on the Conga platform. The BMS negotiated correctly with the charger, protection thresholds triggered at expected voltages, and cell balancing completed across all four series cells.
• Dock charging habit on robotic vacuums: Do not leave the Conga sitting on its charging dock permanently between cleaning sessions. Robotic vacuums on continuous dock charge accumulate trickle-charge stress that degrades cell capacity faster than normal cycle use. 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 Conga 5090

The Conga's motor controller monitors pack voltage continuously. When a degraded cell causes pack voltage to sag under load — even while the indicator still shows charge remaining — the controller reduces motor power to stay within safe operating limits. This is not a sensor fault; it is the BMS responding to real voltage drop under the suction motor's draw. A fresh 14.8V pack holds voltage more firmly under load, so the motor runs at full speed for the full cleaning cycle. If suction drops early on a new battery, check the filter first — a blocked filter forces the motor to draw harder and triggers the same sag response.

Motor cuts out mid-clean and then restarts on its own

This is a BMS overcurrent trip, not a mechanical fault. When suction pathways are restricted — clogged filter, tangled brush roll, or blocked inlet — the motor draws sustained current above the BMS trip threshold, and the pack shuts off to protect the cells. The BMS resets automatically once current demand drops, which is why the robot appears to recover on its own. Clear the filter and brush roll, then check that the inlet is unobstructed. If the cutout stops after cleaning those components, the battery and motor are both fine; restricted airflow was the cause.