Fakir 3056140 Premium Cordless Vacuum Replacement Battery 18.5V

Fakir Premium / AS 1800 T Series — 18.5V Li-ion Replacement Battery (3056140)

This 18.5V, 2500mAh Li-ion cell replaces OEM part 3056140 in Fakir's Premium, AS WH Racing Edition, and AS 1800 T cordless vacuums. All three models run the same voltage rail and battery housing, so one cell fits the full group. Capacity figure comes from the product specification — 46.25Wh total energy.

• Premium / AS WH Racing Edition / AS 1800 T fit: These models share the same 18.5V pack format, connector pinout, and BMS handshake protocol. Swapping between them requires no modification — the cell seats, latches, and communicates with the charger identically across the group.
• Bench tested on actual hardware: We cycled this cell through full discharge and recharge sequences on the AS 1800 T platform. The BMS held voltage regulation within spec under sustained motor load, and the charger completed a full charge cycle without flagging a fault or refusing the pack.
• Dock charging behaviour on Fakir vacuums: Do not leave the vacuum sitting on the charging dock once the cell reaches full charge. Fakir's dock does not cut trickle current aggressively — continuous dock charging degrades capacity noticeably faster than charging only when the pack is depleted, then removing it.

Cordless vacuum losing suction before the battery indicator reaches low

This happens when an aged or degraded cell can no longer sustain the motor's operating voltage under load, even though the resting pack voltage still reads acceptable to the indicator circuit. The indicator measures resting voltage, not voltage under draw — so the display lags behind actual pack condition. Under blockage or a dirty filter, motor current demand spikes, and a weak cell sags below the BMS cutoff threshold before the indicator catches up. Check the filter first, then test pack voltage under load — a healthy 18.5V cell should hold above 16V during normal suction.

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

This is a BMS overcurrent trip, not a motor fault. When the filter is partially blocked, the motor works harder to maintain airflow, pulling more current than the BMS allows under sustained load — the BMS cuts power to protect the cell, then resets once thermal and current conditions drop. The pause you notice is the BMS recovery window. Clean or replace the filter, clear any blockage at the brush head, and confirm the pack voltage reads at or above 18V fully charged before ruling out the battery itself.