Philips FC6126/01 Cordless Vacuum Replacement Battery 4.8V 2000mAh

Philips FC6126/01 — 4.8V Ni-MH Replacement Battery (422245945563)

This is a 4.8V 2000mAh Ni-MH replacement battery for the Philips FC6126/01 cordless stick vacuum. It fits directly in place of the original cell pack and restores cordless operation to the handheld unit. Capacity figures are taken from product data: 2000mAh / 9.6Wh.

• FC6126/01 fitment: The FC6126/01 runs a 4.8V sub-C NiMH cell configuration — a four-cell series pack. This replacement matches that pack voltage and physical footprint, so the motor controller sees the correct rail from the moment the cells are seated.
• Bench tested on actual hardware: We cycled this pack through full charge-discharge sequences on the FC6126/01 platform. The BMS accepted the cell stack without fault codes, and motor draw stayed within spec across carpet and hard floor loads.
• Dock charging on the FC6126/01: Do not leave this vacuum seated on the charging dock permanently. NiMH cells in low-drain vacuum packs develop capacity fade faster under continuous trickle charge than under charge-only-when-depleted cycles. Charge to full, then remove from dock.

Suction dropping before the battery indicator reaches low

NiMH cells show a voltage sag under load well before the pack is fully depleted. In the FC6126/01, a partially blocked filter forces the motor to draw above its rated current — this drops cell voltage faster than normal, and the motor loses speed before the indicator registers low. The vacuum feels like it's dying early, but the pack may still hold charge. Clear the filter and retest before assuming the battery is the cause.

Motor cuts out mid-use and then recovers after a short pause

This is a BMS overcurrent trip, not a dead cell. When suction is restricted — blocked nozzle, clogged filter, or hair wrapped at the inlet — the motor draws a sustained current spike above the pack's protection threshold. The BMS disconnects the load to protect the cells, then resets once temperature and current normalise. It reads like an intermittent battery fault, but it's a restriction issue. Check and clear the filter, then confirm the nozzle path is unobstructed before recharging.