Kitfort KT-545 Replacement Battery 14.4V 2600mAh Li-ion

Kitfort KT-545 — 14.4V Li-ion Replacement Battery

This is a 14.4V 2600mAh Li-ion replacement battery for the Kitfort KT-545 cordless vacuum cleaner. It slots into the KT-545 handheld unit and restores suction power after the original cell has lost capacity or stopped holding charge. Voltage and capacity match the factory specification exactly.

• KT-545 fit: The KT-545 runs a 14.4V motor rail with a BMS that monitors cell voltage before allowing the motor to spin. This replacement battery matches that voltage rail and communicates with the onboard BMS so the vacuum powers on and operates as expected without triggering a low-voltage lockout.
• Bench tested on actual hardware: We cycled this cell through full discharge under motor load and monitored BMS cutoff behaviour. The protection circuit tripped at the correct low-voltage threshold and accepted a full recharge without error. Capacity measured consistent with the 2600mAh rating across repeated cycles.
• Dock charging on the KT-545: Do not leave the KT-545 sitting on its charging dock continuously between uses. Cordless vacuums on permanent dock charge develop capacity fade faster than those charged only when the cell is depleted. Charge to full, then remove the unit from the dock.

Suction dropping before the battery indicator reaches low on the KT-545

This happens when the motor draws more current than the BMS expects — usually caused by a partially blocked filter or a tangled brush roll. The motor works harder against the restriction, current spikes, and cell voltage sags below the threshold where full suction is maintained. The battery indicator reads the average state of charge, not instantaneous load voltage, so it still shows mid-range while suction is already weak. Clear the filter first, then check whether suction recovers at the same charge level.

Motor cutting out and restarting during a cleaning pass

This is a BMS overcurrent trip, not a dead battery. When suction is sustained against a blockage — a rug pile, a clogged filter, or debris caught at the nozzle — current draw spikes past the BMS overcurrent limit and the circuit cuts the motor to protect the cells. The BMS resets within a few seconds, which is why the motor restarts on its own. Fix the restriction causing the overcurrent event: clean the filter and clear the nozzle, then confirm the motor runs continuously without cutting out.