Fomt R620C Stick Vacuum Replacement Battery 14.8V 2600mAh

Fomt R620C — 14.8V Li-ion Replacement Battery

This is a 14.8V, 2600mAh (38.48Wh) Li-ion battery for the Fomt R620C cordless stick vacuum. It replaces the original pack when capacity has dropped or the battery no longer holds a charge. Fits the R620C model specifically.

• R620C platform fit: The R620C runs a 14.8V four-cell Li-ion pack to drive the motor and brush roll. This replacement matches that voltage rail and cell configuration, so the BMS communicates correctly with the vacuum's charge and discharge circuitry.
• Bench tested on actual hardware: We cycled this pack through charge and full discharge on the R620C platform. The BMS held its overcurrent threshold correctly under simulated restricted-filter load, and the charge cutoff triggered cleanly at capacity.
• Dock charging habit on the R620C: Do not leave the R620C on the charging dock continuously. Cordless vacuums held on trickle charge develop capacity fade significantly faster than those charged only when depleted. Charge to full, then remove the vacuum from the dock.

Suction dropping before the battery indicator reaches low on the R620C

This happens when the motor draws more current than the BMS allows under load — not because the battery is empty. A partially blocked filter forces the motor to work harder, spiking current draw and causing the BMS to throttle output voltage before the indicator reflects a low state. The vacuum feels like it's losing charge early, but the real trigger is restricted airflow. Clean or replace the filter first, then recheck suction performance at full charge.

Motor cuts out mid-clean, then recovers after a short pause

This is a BMS overcurrent trip — not a faulty battery. When sustained suction restriction drives current above the protection threshold, the BMS disconnects the output to protect the cells. After a brief thermal or timer reset, it reconnects and the motor starts again. The fix is clearing the blockage or cleaning the filter before the next run. If cutouts continue on an unblocked machine, check that cell voltage at rest is above 14.0V — below that, the pack may need replacement.