Fun Beat VS600 Cordless Vacuum Replacement Battery 14.4V 4000mAh

Fun Beat VS600 / VacuSmart 600 — 14.4V Ni-MH Replacement Battery

This is a 14.4V, 4000mAh Ni-MH replacement battery for the Fun Beat VS600 and VacuSmart 600 cordless stick vacuums. It slots into the battery compartment and restores suction power when the original cell has lost capacity or stopped holding charge. Capacity is rated at 57.6Wh.

• VS600 and VacuSmart 600 compatibility: Both models share the same 14.4V power rail, battery housing dimensions, and cell count — 179 x 51 x 52mm pack. The motor controller in each draws from the same voltage window, so one battery fits both without modification.
• Bench tested on actual hardware: We ran this pack through charge cycles on the VS600 and confirmed the BMS holds voltage within the motor controller's operating range. Cell balance across the Ni-MH stack was stable through repeated load cycles at the vacuum motor's rated draw.
• Dock charging behaviour on Ni-MH cells: Do not leave the VS600 on the charging dock permanently. Ni-MH cells develop capacity fade faster than Li-ion under continuous trickle charge. Charge to full, then remove the vacuum from the dock until the next use.

Suction dropping before the battery indicator reaches low

Ni-MH cells sag under sustained motor load faster than the indicator circuit tracks. When the VS600 motor draws hard — on carpet or during extended use — pack voltage can drop below the motor controller's efficient operating threshold while the indicator still reads mid-range. The result is weaker suction with no low-battery warning. If this happens, check filter condition first: a partially blocked filter forces the motor to draw above rated current, accelerating voltage sag.

Motor cutting out mid-clean and then recovering after a pause

This is a BMS overcurrent trip, not a dead battery. When suction is restricted — blocked filter, clogged brush roll, or heavy carpet pile — the motor pulls current beyond the BMS cutoff threshold and the pack shuts output temporarily. Removing the blockage or clearing the filter drops motor draw back below the trip point, and the BMS resets after a short pause. Clean or replace the filter, then restart the vacuum; if the cutout stops, current draw was the cause, not cell failure.