RoboJet Duel 14.4V Replacement Battery P14421004 2600mAh

RoboJet Duel / Duel 2 — 14.4V Li-ion Replacement Battery (P14421004)

This 14.4V 2600mAh Li-ion battery replaces part number P14421004 in the RoboJet Duel and Duel 2 robotic vacuum cleaners. It powers the motorized brush roll and suction motor through full automated cleaning cycles. Swap it in when the original cell no longer holds enough charge to complete a run.

• Duel and Duel 2 compatibility: Both models run the same 14.4V power rail, use the same P14421004 connector and BMS handshake, and accept this cell without modification or firmware conflict.
• Bench tested on actual hardware: We ran this cell through charge and discharge on a Duel unit. The BMS communicated correctly with the vacuum's control board, charge acceptance was normal, and the motor and brush roll started without fault codes.
• Dock charging habit on the Duel: Do not leave the Duel sitting on its charging dock permanently between uses. Continuous trickle charging accelerates capacity fade on Li-ion cells at this voltage. Charge to full, then lift the unit off the dock until the next session.

Suction dropping before the battery indicator reaches low

A partially blocked filter forces the Duel's suction motor to draw more current than its rated load. The battery voltage sags under that elevated draw even when cell charge is still high, which the indicator does not reflect. The result is noticeably weaker suction while the display still shows two or three bars. Clean or replace the filter first — if suction restores, the battery is not the cause. If sag continues with a clean filter on a new cell, check that resting voltage sits at or above 16.4V after a full charge.

Motor cuts out mid-cycle then recovers on its own

This is a BMS overcurrent trip, not a power-off event. When the brush roll hits a rug edge, a cable, or a blockage, motor current spikes sharply. The BMS interrupts the circuit to protect the cell, the motor stops, and the BMS resets itself within a few seconds once current drops. It will keep tripping on the same obstacle if the restriction is not cleared. Check the brush roll for wrapped hair or debris, and verify the filter is not restricting airflow before assuming the battery is at fault.