About this replacement
Philips FC8772 / FC8710 Series — 14.8V Li-ion Replacement Battery (4ICR19/65)
This 14.8V 3400mAh Li-ion battery pack replaces the original cell in Philips FC8772, FC8710, FC8776, FC8705, and over 25 additional FC-series cordless vacuums. OEM part numbers covered: 4ICR19/65, CP0111/01, and 3000-014-15881. Capacity matches the original specification at 50.32Wh.
- FC8700-series platform fit: These models share the same 14.8V four-cell Li-ion architecture, connector pinout, and BMS communication protocol. A single replacement cell services the full range without modification.
- Bench tested on actual hardware: We ran this pack through charge and discharge cycles on an FC8772 unit. The BMS initialised correctly on first charge, protection thresholds tripped as expected under simulated overcurrent, and cell balancing completed without fault flags.
- Dock charging habit on FC-series vacuums: Do not leave this vacuum sitting on the charging dock permanently. FC-series vacuums on continuous dock power develop accelerated capacity fade — faster than almost any other cordless vacuum category. Charge to full, then remove from the dock until the next use.
Suction dropping before the battery indicator reaches low
This happens when the motor draws more current than the BMS allows under a restricted airflow condition. A partially blocked filter forces the motor to work harder, pulling sustained high current that triggers a soft voltage sag before the cell is actually depleted. The vacuum loses suction noticeably but the indicator still reads mid-charge. Clean or replace the filter first — if suction recovers immediately, the battery is not the cause.
Motor cuts out for a few seconds then restarts on its own
This is a BMS overcurrent trip, not a battery fault. When the vacuum picks up a blockage or runs on deep carpet with a dirty filter, motor current spikes past the pack's protection threshold. The BMS disconnects the output, waits for the overcurrent condition to clear, then reconnects — usually within two to five seconds. Clear any blockage, check the filter, and confirm the resting pack voltage reads at least 15.5V after a full charge before assuming the cell is faulty.