Concept VR3550 Replacement Battery 14.8V 5200mAh D093-4S2P

Concept VR3550 — 14.8V Li-ion Replacement Battery (D093-4S2P)

This is a 14.8V, 5200mAh Li-ion replacement battery for the Concept VR3550 cordless stick vacuum. It uses OEM part number D093-4S2P and slots directly into the VR3550 battery bay. Voltage and cell configuration match the original pack.

• VR3550 fitment: The VR3550 runs a 4S2P cell arrangement at 14.8V nominal. This pack replicates that layout exactly — same connector, same BMS handshake the charger expects, same voltage rail the motor controller draws from.
• Bench tested on actual hardware: We cycled this pack through full charge and discharge runs on the VR3550 platform. The BMS handled motor-start inrush current without tripping, and the charger accepted the pack without error codes.
• Dock charging habit on the VR3550: Do not leave the VR3550 sitting on the charging dock continuously. Constant trickle charge accelerates capacity fade in Li-ion packs faster than normal cycle wear. Charge to full, then remove from the dock until the next use.

Suction dropping before the battery indicator reaches low on the VR3550

This happens when the motor is working harder than rated — usually a partially blocked filter or a restricted airpath. The motor draws more current to maintain suction, which pulls the cell voltage down faster than the indicator accounts for. The battery indicator reads state of charge, not actual voltage under load, so it lags behind real-world depletion. Clean or replace the filter first, then retest — a clean filter cuts motor draw back to rated levels and the pack will last significantly longer per charge.

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

This is a BMS overcurrent trip, not a dead battery. When airflow is restricted — blocked filter, full dustbin, or a carpet-pile jam — the motor spikes current to compensate, and the BMS shuts the output rail to protect the cells. After a few seconds the BMS resets and power returns. Clear the blockage, empty the bin, and check the filter before continuing. If the cutout repeats on a clean machine with a freshly charged pack sitting at or above 15.5V resting voltage, the motor brushes or fan assembly may need inspection.