Tineco FW020100US 22.2V Replacement Battery 61SR18650-2200

Tineco FW020100US / iFLOOR Series — 22.2V Li-ion Replacement Battery (61SR18650-2200)

This is a 22.2V, 2500mAh (55.5Wh) Li-ion battery pack for the Tineco FW020100US, FW15M-01, HF10E-01, and iFLOOR IPX4 cordless stick vacuums. It replaces OEM part numbers 61SR18650-2200, 6ICNMR19-66, 6IRS18650, and 6ISR18650-2500. If your original pack no longer holds a charge or suction drops within minutes of starting, this is the correct replacement.

• FW020100US and iFLOOR platform fit: These models share the same 22.2V cell configuration, connector pinout, and BMS handshake protocol. Swapping between them works because the battery management system uses identical charge and discharge communication across this Tineco lineup.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on a FW020100US unit. The BMS accepted the handshake on first connection, current draw stayed within rated parameters across carpet and hard floor modes, and the charge indicator tracked accurately through all states.
• Dock charging habit on cordless vacuums: Do not leave the vacuum sitting on the charging dock permanently. Cordless stick vacuums on continuous dock power develop capacity fade faster than units charged only when the pack is depleted. Charge to full, then remove from the dock.

Suction dropping before the battery indicator reaches low

On the FW020100US, suction loss often happens before the LED indicator signals a low pack. This is voltage sag — the cell voltage drops under motor load faster than the indicator circuit registers it. A partially blocked filter forces the motor to draw more current than rated, which accelerates the sag. Clean the filter first, then test; if suction stabilises, the filter was the cause, not the cells.

Motor cutting out mid-clean and then recovering

If the motor stops abruptly during a cleaning pass but restarts after a few seconds, the BMS has tripped on an overcurrent event. This happens when restricted airflow — blocked filter or blocked brush roll — causes sustained high current draw. The BMS cuts power to protect the cells, then resets once current normalises. Clear the blockage completely and verify the filter is seated correctly before running the vacuum again.