Bosch BBHMOVE7 20.4V Ni-MH Replacement Battery FD9406

Bosch BBHMOVE7 Series — 20.4V Ni-MH Replacement Battery (FD9406)

This is a 20.4V Ni-MH battery rated at 3000mAh (61.2Wh), built to fit the Bosch BBHMOVE7 and BBHMOVE7/04 cordless handheld vacuum. It replaces OEM part FD9406 directly. When the original cell loses capacity, the suction motor is first to suffer — this swap restores full motor voltage from the start of each run.

• BBHMOVE7 and BBHMOVE7/04 fit: Both variants use the same 20.4V cell format, connector, and BMS handshake. The FD9406 part number covers the full BBHMOVE7 production run — no wiring adapters or firmware changes needed.
• Bench tested on actual hardware: We ran this cell through full discharge cycles on the BBHMOVE7 motor load. The BMS held steady voltage across the suction stage, with no mid-cycle cutoff under normal filter conditions.
• Dock charging on the BBHMOVE7: Do not leave this vacuum seated on the dock permanently. Ni-MH cells in cordless vacuums develop capacity fade faster under continuous trickle charge than cells charged only when depleted. Charge to full, then remove from the dock.

Suction dropping before the battery indicator reaches low on the BBHMOVE7

Ni-MH cells show voltage sag under load before the indicator circuit registers a low-battery state. On the BBHMOVE7, the suction motor draws hard at startup and under carpet load — an ageing or depleted cell sags below the motor's operating voltage before the indicator catches up. The indicator reads state-of-charge at rest, not under load. If suction weakens noticeably during a run but the light stays green, the cell is the cause, not the filter.

Motor cuts out mid-run and then recovers after a few seconds

This is a BMS overcurrent trip, not a motor fault. When the filter is partially blocked, the motor draws more current trying to maintain suction — the BMS reads this as an overload and cuts the circuit. The cell cools slightly, the BMS resets, and power returns. Check and clean the filter first. If the cutout continues on a clean filter, measure resting cell voltage — a healthy Ni-MH 20.4V pack should read above 22V at full charge.