Cecotec 05429 Cordless Vacuum Replacement Battery 14.4V 3500mAh

CECOTEC 05429 / Conga 2090 Vision — 14.4V Li-ion Replacement Battery

This 14.4V 3500mAh Li-ion battery replaces the original pack in the CECOTEC 05429 and Conga 2090 Vision cordless stick vacuums. When the original cell degrades and suction becomes noticeably weaker mid-clean, this is the part that restores full motor voltage. Capacity is 3500mAh (50.4Wh), matching the factory specification.

• 05429 and Conga 2090 Vision fit: Both models run the same 14.4V architecture and share an identical battery bay connector and BMS handshake requirement. One pack covers both platforms without modification.
• Bench tested on actual hardware: We cycled this pack through full charge and discharge on a 14.4V vacuum motor load. The BMS held charge cutoff at the correct upper threshold and tripped overcurrent protection cleanly when the motor draw spiked under a blockage simulation.
• Dock charging practice on the Conga 2090 Vision: Do not leave this vacuum sitting on the dock continuously between uses. The Conga 2090 Vision charging circuit does not cut power once the pack is full, so leaving it docked indefinitely accelerates capacity fade. Charge to full, then remove from the dock.

Cordless vacuum losing suction before the battery indicator reaches low

This happens because the motor draws higher current when airflow is restricted — a partially blocked filter forces the motor to work harder, which pulls the pack voltage down faster than the indicator circuit expects. The indicator reads state of charge, not motor load, so it can show two bars while suction is already noticeably weak. Clean or replace the filter first before concluding the battery is at fault. If suction recovers after a filter clean, the pack is likely fine.

Motor cuts out mid-clean then recovers 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 brush roll, current draw exceeds the BMS threshold and it interrupts output to protect the cells. The BMS resets itself after a short cooldown, which is why power returns. Clear the blockage, check the brush roll for hair wrap, and check that the filter is clean. If trips continue on a clear vacuum, verify the pack is reading at least 14.4V fully charged before suspecting a cell fault.