Midea Q9 Station 25.9V Replacement Battery Q9-2510-7S1P-A

Midea Q9 Station — 25.9V Li-ion Replacement Battery (Q9-2510-7S1P-A)

This is a 25.9V 2500mAh Li-ion replacement battery for the Midea Q9 Station robotic vacuum cleaner. It slots directly into the Q9 Station chassis and powers the motorized cleaning system, brush roll, and suction motor. Capacity is 2500mAh (64.75Wh), matching the original specification.

• Q9 Station compatibility: The Q9 Station runs a 7-cell series Li-ion pack at a 25.9V nominal rail. This battery matches that cell configuration, voltage, and the BMS communication protocol the Q9 Station's onboard charger expects. A mismatched BMS handshake will prevent charging entirely, so cell count and BMS spec both matter here.
• Bench tested on actual hardware: We cycled this battery through full discharge and recharge sequences on the Q9 Station platform. The BMS engaged overcurrent protection correctly under simulated motor-start load spikes and released cleanly after the surge cleared.
• Dock charging habit on the Q9 Station: The Q9 Station auto-docks after each cleaning cycle, which means the battery sits on trickle charge continuously unless you intervene. That constant low-current charge degrades cell capacity faster than normal use cycles. Charge to full, then remove the unit from the dock if it won't run again for several days.

Suction dropping before the battery indicator reaches low

The Q9 Station's suction motor draws peak current under load — thick carpet, debris buildup, or a partially blocked filter all force the motor to work harder. When current draw rises, the battery voltage sags under load before the state-of-charge indicator registers anything unusual. The BMS reads this voltage sag as a low-cell condition and begins throttling motor power. Clean the filter and check the brush roll for obstructions first — a clear airflow path brings motor draw back within the battery's rated output range.

Motor cutting out mid-cycle and then recovering after a pause

This is a BMS overcurrent trip, not a dead battery. When suction is restricted — blocked filter, tangled brush roll, debris jam — the motor sustains a high current draw for long enough that the BMS cuts the output circuit to protect the cells. The unit powers back on after a short pause because the BMS resets once the overcurrent condition clears and cell temperature drops. Clear the filter and brush roll before restarting. If the cutout repeats immediately, check that the replacement battery's BMS overcurrent threshold matches the Q9 Station's motor spec — rated trip threshold is tied to the 25.9V 7-cell pack configuration.