Moulinex MS6543 Cordless Vacuum Replacement Battery 14.4V 2000mAh

Moulinex MS6543 / MS6545 Series — 14.4V Li-ion Replacement Battery

This is a 14.4V, 2000mAh (28.8Wh) Li-ion replacement battery for the Moulinex MS6543 and MS6545 cordless stick vacuum range. It covers the MS6543WH/BA0 and MS6545WI/BA0 variants. Fit this when the original cell no longer holds a useful charge or the vacuum loses suction well before the indicator reads low.

• MS6543 and MS6545 compatibility: Both model lines run the same 14.4V battery bay with an identical connector and BMS handshake. The shared architecture means one cell covers all four listed variants without modification.
• Bench tested on actual hardware: We cycled this cell under simulated motor load matching the MS6543 drive circuit. The BMS held voltage above the motor's minimum threshold across repeated discharge cycles and did not trip under normal carpet-cleaning draw.
• Dock charging on the MS6543 and MS6545: Do not leave the vacuum sitting on the charging dock after the cell reaches full charge. These models have no dock-level charge interrupt, so the battery stays in a trickle-charge state indefinitely. Charge fully, then remove the vacuum from the dock until the next use.

Suction dropping before the battery indicator reaches low

The MS6543 motor pulls harder when airflow is restricted — a partially blocked filter raises current draw above rated levels. The BMS responds to that elevated draw by pulling back voltage delivered to the motor, which reads to the user as suction loss rather than a battery warning. The battery indicator measures cell voltage at rest, not under load, so it can still show mid-range charge while the motor is being starved. Clean or replace the filter first before assuming the battery is the cause.

Motor cuts out mid-clean and then recovers after a short pause

This is a BMS overcurrent trip, not a dead battery. When the filter is restricted or the nozzle is blocked, sustained high-resistance airflow forces the motor to draw current beyond the BMS trip threshold. The BMS shuts the output, the motor stops, and after a few seconds the BMS resets and allows restart. Clear the blockage and check the filter — if the trip stops occurring, the cell is fine. If it persists on a clean, unblocked vacuum, verify the replacement battery's BMS trip threshold matches the 14.4V drive circuit's rated operating current.