Midea M4 Cordless Vacuum Replacement Battery 14.4V 3400mAh

Midea M4 Cordless Vacuum — 14.4V Li-ion Replacement Battery

This is a 14.4V, 3400mAh (48.96Wh) lithium-ion replacement battery for the Midea M4 cordless stick vacuum. It replaces the original cell pack when the factory battery no longer holds a full charge. The battery fits directly into the M4 battery compartment and communicates with the vacuum's onboard BMS.

• Midea M4 fitment: The M4 runs a 14.4V nominal rail across its motor and suction control board. This replacement matches that voltage requirement and uses the same connector orientation and BMS communication protocol as the factory pack — the vacuum powers on and reads charge state without reconfiguration.
• Bench tested on actual hardware: We cycled this battery through full charge and discharge on the M4 platform. The BMS handled motor-start inrush current without tripping, and charge state reporting to the indicator LEDs tracked accurately across the full discharge curve.
• Dock charging habit for the M4: Do not leave the M4 on the charging dock permanently. Continuous trickle charge compresses the cells' usable range faster than normal cycling. Charge the battery to full, then remove it from the dock until the next use.

Suction dropping before the battery indicator reaches low

This happens when the motor draws above its rated current — usually from a partially blocked filter or a full dustbin — and the BMS reduces output voltage to protect the cells before the indicator registers a low charge state. The vacuum still appears to have battery remaining, but motor speed has already dropped. Clear the filter and empty the bin first, then retest. If suction recovers immediately, the battery is not the cause — restricted airflow was forcing higher current draw.

Motor cutting out mid-clean and then recovering after a short pause

This is a BMS overcurrent trip, not a flat battery. When the M4 motor sustains restricted suction — blocked filter, dense carpet, or hair wrap on the brush roll — current draw spikes above the BMS threshold and the pack shuts output off momentarily. The BMS resets after a few seconds, which is why the vacuum restarts on its own. Clean the filter and remove any obstruction from the brush roll. If the cutout stops after clearing those, the battery is functioning correctly — check that the filter is fully dry before reinserting if it was washed.