V-tac VT-5555 Cordless Vacuum Replacement Battery 14.4V 2600mAh

V-tac VT-5555 / VT-5556 — 14.4V Li-ion Replacement Battery

This is a 14.4V 2600mAh Li-ion battery pack for the V-tac VT-5555 and VT-5556 cordless stick vacuums. It replaces a worn original cell that has lost capacity through repeated charge cycles. Voltage and connector match the stock configuration on both models.

• VT-5555 and VT-5556 compatibility: Both models run the same 14.4V motor rail and use the same battery housing and connector. One cell fits either unit without modification.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on representative 14.4V vacuum hardware. The BMS responded correctly to motor-start current draw and cut off cleanly at low-voltage threshold without false trips under normal suction load.
• Dock charging on the VT-5555 and VT-5556: Do not leave the vacuum sitting on the charging dock permanently. These units trickle charge when left docked, and continuous trickle charge accelerates cell degradation noticeably faster than charging only when the battery is depleted. Charge to full, then remove from the dock.

Suction dropping before the battery indicator reaches low on the VT-5555

This happens because the motor draws more current when airflow is restricted — a partially blocked filter forces the motor to work harder, pulling higher amps than the BMS expects at that state of charge. Voltage sags under that elevated load even though the cell still has usable capacity remaining. The indicator reads the resting voltage, not the loaded voltage, so it shows charge remaining while suction is already weak. Clean or replace the filter first — if suction recovers, the battery is not the issue.

Motor cuts out mid-clean then restarts after a few seconds

This is a BMS overcurrent trip, not a dead battery. When suction is sustained against a blockage or a heavily loaded carpet, current draw spikes above the BMS trip threshold and the pack disconnects to protect the cells. The BMS resets after a short cooldown, which is why power returns. Clear any blockage, check the filter is clean, and retry — if the cutouts stop, the cell is functioning correctly. If they persist on a clear airway, verify the charger brought the pack to a full 16.8V before use.