Midea M4 Replacement Battery 14.4V 2600mAh Li-ion

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

This is a 14.4V, 2600mAh (37.44Wh) lithium-ion battery pack for the Midea M4 cordless stick vacuum. It replaces the original pack when capacity has faded or the battery no longer holds charge. Dimensions are 70 × 38 × 38mm — confirm your existing pack matches before ordering.

• Midea M4 platform fit: The M4 stick vacuum runs a 14.4V motor bus. This pack matches that voltage rail and the physical connector used across the M4 series. A voltage mismatch at the battery-to-motor interface will trigger an immediate BMS lockout, so the 14.4V spec here is the critical number.
• Bench tested on actual hardware: We ran this pack through repeated charge cycles and monitored BMS response under motor-start load. The protection circuit handled inrush current without tripping at rated draw, and cell voltage stayed balanced across the pack during discharge.
• Dock charging habit on the M4: Do not leave the M4 sitting on the charging dock permanently. Continuous trickle charge from the dock degrades lithium cell capacity faster than standard charge cycles. Charge to full, then remove the vacuum from the dock until the next use.

Suction dropping before the battery indicator reaches low on the M4

This is a voltage sag issue, not always a dead battery. When the M4 motor hits resistance — thick carpet, a partial blockage, or a clogged filter — current draw spikes. A worn or partially degraded pack cannot sustain voltage under that spike, so motor speed drops even though the charge indicator still reads mid-range. Check and clean the filter first. If suction recovers after a filter clean, the battery was masking a restriction problem. If suction stays low with a clean filter and a fully charged pack, cell capacity has faded below the threshold the motor needs at peak draw.

M4 motor cuts out mid-session and then recovers after a short pause

This is a BMS overcurrent trip. The protection circuit cuts power when sustained current draw exceeds the pack's rated limit, then resets once the cells cool slightly. On the M4, a blocked filter is the most common trigger — restricted airflow forces the motor to work harder, drawing more current than the BMS allows. Clear the filter and check the brush roll for wrapped debris before assuming the battery is faulty. If the cutout stops after cleaning, the pack is functioning correctly — it was protecting itself from a load the motor should never have been pulling.