ORCA 300 Replacement Battery 25.9V 7800mAh Li-ion

ORCA 300 Cordless Vacuum — 25.9V Li-ion Replacement Battery (CF300AKU)

This 25.9V lithium-ion battery pack replaces the original cell in the ORCA 300 cordless stick vacuum. It carries 7800mAh capacity and matches the OEM voltage rail and BMS handshake the 300's charging circuit expects. Fits the ORCA 300 series using OEM references CF300AKU and OC30CL-24.

• ORCA 300 platform fit: The 300 series runs a 25.9V rail — six lithium cells in series. Any replacement must hold that nominal voltage and present the correct BMS communication to the charger. This pack matches both, so the charger completes its handshake and charges normally rather than cutting off early.
• Bench tested on actual hardware: We cycled this pack through full discharge and recharge on the ORCA 300 platform. The BMS handled motor-start inrush without tripping, held voltage steady through mid-cycle, and accepted the charger handshake cleanly on every test cycle.
• Dock charging habit on the ORCA 300: Remove the vacuum from the charging dock once the indicator shows full. The ORCA 300 dock does not cut trickle current aggressively — leaving it connected overnight repeatedly compresses cell capacity faster than normal cycling would.

Suction dropping before the battery indicator reaches low

This happens when the motor draws more current than the BMS expects — usually because a partially blocked filter is forcing the motor to work harder. Increased motor load pulls the pack voltage down faster than normal, and the BMS reads that sag as a low-battery condition before the cells are actually depleted. Clean or replace the filter first. If suction stabilises across a full charge cycle after that, the battery was not the problem.

Motor cutting out mid-clean and then recovering after a few seconds

This is a BMS overcurrent trip, not a dead battery. When the vacuum sustains a blocked airpath — carpet fibres packed against the filter, or a partial blockage in the head — the motor draws a spike of current the BMS flags as unsafe and briefly disconnects the cell. Power recovers once the BMS resets, usually within three to five seconds. Clear the blockage and check the filter before assuming the pack is faulty. If trips persist on a clean, unblocked vacuum, verify pack voltage at the terminals reads above 22V before charging.