Philips FC8820 14.4V Replacement Battery 4ICR19/65 3400mAh

Philips FC8820 Series — 14.4V Li-ion Replacement Battery (4ICR19/65)

This is a 14.4V 3400mAh lithium-ion replacement battery for the Philips FC8820 cordless vacuum cleaner. It also fits the FC8810, FC8830, and FC8832, along with several additional models in the same platform. OEM part number is 4ICR19/65.

• FC8810, FC8820, FC8830, FC8832 platform fit: These models share the same 14.4V cell configuration, connector pinout, and BMS handshake protocol. Swapping between them uses the same pack without modification.
• Bench tested on actual hardware: We ran this pack through charge cycles on the FC8820 dock and monitored BMS behaviour under motor-start load. The BMS handled peak draw on carpet mode without tripping, and charge termination fired correctly at full capacity.
• Dock charging discipline for this vacuum: Do not leave the FC8820 sitting on the charging dock continuously. Philips cordless vacuums in this range trickle-charge when docked past full capacity. Charge to full, remove the vacuum from the dock, and only re-dock when the battery is depleted.

Suction dropping before the battery indicator reaches low

This happens when the motor is drawing more current than the BMS expects under restricted airflow. A partially blocked filter forces the motor to work harder, pulling current above the rated draw and causing the BMS to throttle output voltage before the indicator registers low. The vacuum feels like the battery is failing when the real issue is a dirty filter increasing motor load. Clean or replace the filter first — if suction recovers immediately, the battery is fine.

Motor cuts out mid-clean and then comes back on

This is a BMS overcurrent trip, not a dead battery. When the FC8820 hits a sustained blockage — dense carpet pile, a clump of debris at the nozzle, or a clogged filter — current spikes past the BMS cutoff threshold and the pack disconnects to protect the cells. The BMS resets automatically after a few seconds, which is why the vacuum returns to normal. Clear the blockage, check the filter, and verify the nozzle path is unobstructed before resuming. If the trip happens repeatedly on clear floors, check that the replacement pack voltage at rest reads at least 14.0V.