Zaco A4 Replacement Battery 14.8V 2600mAh Li-ion

Zaco A4 / A6 / A8 / A9 Series — 14.8V Li-ion Replacement Battery

This 14.8V 2600mAh Li-ion battery replaces the original pack in the Zaco A4, A6, A8, and A9 robotic vacuum cleaners. It fits the compact 4-cell battery bay used across this model range. Voltage and capacity match factory spec so the robot resumes normal cleaning cycles without recalibration.

• A4 / A6 / A8 / A9 shared platform: These four models run the same 14.8V battery architecture, identical connector pinout, and the same BMS communication protocol. One cell pack covers the full range without modification.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on the A-series platform. The BMS handshake initialised correctly, overcurrent protection tripped as expected under a simulated blockage, and charge termination cut off cleanly at 16.8V.
• Dock charging habit on robotic vacuums: Do not leave the Zaco parked on its dock permanently between uses. These robots trickle-charge continuously when docked, which accelerates capacity fade in the replacement cell just as it did in the original. Charge to full, then remove from dock until the next cleaning run.

Suction dropping before the battery indicator reaches low

This happens when the filter is partially blocked — the motor draws harder to maintain airflow, which pulls more current than the BMS's steady-state threshold. Voltage sags under that elevated load even though the cell still holds most of its charge. The robot interprets the sag as near-empty and reduces motor speed to protect the pack. Clean or replace the filter first; if suction restores to full strength, the battery is not the cause.

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

This is a BMS overcurrent trip, not a dead battery. It occurs when sustained suction restriction — a clogged filter or partial brush-roll jam — forces the motor to draw current beyond the protection threshold. The BMS disconnects, waits for the overcurrent condition to clear, then reconnects. Clear the brush roll, wash the filter, and run a short cycle; if the cut-outs stop, the pack is functioning correctly. If cut-outs continue on a clean filter, measure pack voltage at rest — a healthy cell should read at least 15.6V after a full charge.