Ecovacs W830 Replacement Battery 14.8V 800mAh Li-ion

Ecovacs W830 / W850 / W930 — 14.8V Li-ion Replacement Battery (INR14500-3S)

This is a 14.8V, 800mAh Li-ion battery pack for the Ecovacs W830, W830-RD, W850, and W930 robotic vacuum cleaners. It replaces part number INR14500-3S and powers the drive motors, suction fan, and navigation electronics. When the original cell degrades after repeated cycles, cleaning runs shorten and suction drops early — this pack restores normal operation.

• W830, W850, and W930 platform compatibility: These models share the same 14.8V four-cell battery rail, connector housing, and BMS handshake protocol. The INR14500-3S pack fits all of them because the voltage and communication signal are identical across the range.
• Bench tested on actual hardware: We ran this pack through charge and discharge cycles on W830 hardware. The BMS responded correctly to the robot's charge termination signal and triggered overcurrent protection cleanly under a simulated filter-blocked motor load.
• Dock charging behaviour on the W830: Remove the W830 from the dock once the charge indicator shows full. Leaving it docked indefinitely keeps the cells at terminal voltage under a trickle current — this accelerates capacity fade faster than normal cycling does.

Suction dropping before the battery indicator shows low

This happens when the motor draws more current than the pack can sustain cleanly — voltage sags under load even though the BMS reports adequate charge. On a degraded cell, this gap between indicated capacity and usable voltage widens quickly. A new INR14500-3S pack restores the voltage floor the suction motor needs to maintain consistent airflow. If suction still drops early after fitting a new pack, check the filter — a partially blocked filter forces the motor to draw above its rated current, which triggers the same symptom.

Motor cuts out mid-cycle then restarts on its own

This is an overcurrent trip from the BMS, not a loose connection or software fault. When airflow is restricted — by a full dustbin, a blocked filter, or carpet fibres caught in the brush roll — the motor pulls sustained high current and the BMS shuts the output to protect the cells. The pack resets once current drops, which is why the robot restarts a few seconds later. Clear the filter and brush roll first. If the cutout continues on an unblocked machine, the original pack's cells have degraded to the point where normal motor-start current is enough to trip the threshold — replace the battery.