Conga Excellence 990 Replacement Battery 14.4V 2600mAh

Conga Excellence 990 Series — 14.4V Li-ion Replacement Battery

This is a 14.4V 2600mAh lithium-ion battery for the Conga Excellence 990, 990 Vital, and 1090 robotic vacuum series. It slots into the underside battery bay and reconnects to the vacuum's main board via the original connector. Capacity is rated at 37.44Wh, matching the original cell specification.

• Excellence 990 and 1090 platform compatibility: These models share the same 14.4V battery bay, connector pinout, and BMS handshake protocol. The same cell pack works across the range because Conga standardised the battery interface across this generation of robot vacuums.
• Bench tested on actual hardware: We ran this cell through a full charge and discharge cycle on a 990-series unit. The BMS negotiated correctly with the charger, charge termination triggered at the expected voltage, and the vacuum's indicator cleared without fault codes.
• Dock charging habit for this vacuum: Do not leave the Conga on the charging dock permanently between uses. Continuous trickle charge on lithium cells in robot vacuums accelerates capacity fade faster than periodic charge cycles. Charge to full, then remove from the dock until the next clean.

Suction dropping before the battery indicator shows low on the Excellence 990

The 990's motor draws more current when airflow is restricted — a partially blocked filter forces the motor to work harder, pulling the cell voltage down faster than the indicator expects. The indicator reads state of charge, not motor load, so the display still shows adequate charge while suction is already weak. A degraded cell compounds this because internal resistance rises with age, causing voltage to sag further under the same load. Clean the filter first; if suction still drops early with a new battery, check for blockages in the brush roll housing.

Motor cuts out mid-cycle then recovers after a few seconds

This is a BMS overcurrent trip, not a battery failure. When the brush roll snags carpet fibres or debris, current draw spikes sharply — the BMS cuts power to protect the cell, then resets once the draw drops back below the trip threshold. It can look like a flat battery but the vacuum restarts on the same charge. Clear the brush roll, check that the filter is clean, and run the vacuum again — if the cutout stops, the BMS was responding correctly to a restricted motor, not a faulty cell.