Ecovacs Deebot Ozmo 900 Replacement Battery 14.4V 3400mAh

Ecovacs Deebot Ozmo 900 Series — 14.4V Li-ion Replacement Battery (S01-LI-148-2600)

This 14.4V 3400mAh Li-ion battery replaces the original power cell in the Ecovacs Deebot Ozmo 900, 901, 905, and 930 robotic vacuum cleaners. It slots into the same bay as the factory unit, connecting to the same BMS-controlled charging circuit. Capacity listed is from product data — 3400mAh, 48.96Wh.

• Ozmo 900 series platform fit: The 900, 901, 905, and 930 all share the same 14.4V battery bay, connector pinout, and BMS handshake protocol. One cell works across the range because Ecovacs kept the power architecture consistent across these models.
• Bench tested on actual hardware: We ran this battery through charge and discharge cycles on the Ozmo 930. The BMS accepted the charger handshake on the first connection, voltage held steady under full suction load, and the protection circuit triggered cleanly at the low-voltage cutoff threshold.
• Dock charging discipline for the Ozmo platform: The Deebot auto-returns to its dock between cycles, which means the battery sits on trickle charge for hours at a time. Remove the unit from the dock after the charge indicator turns solid — leaving it docked continuously accelerates capacity fade on these cells faster than normal use cycles ever will.

Suction dropping before the battery indicator reaches low on the Ozmo 900

This is a voltage sag issue, not a capacity issue. When the filter is partially blocked, the motor draws above its rated current to maintain suction, pulling the pack voltage down earlier than the indicator predicts. The BMS reads the voltage drop and throttles power to the motor before the fuel gauge registers a low state. Clean or replace the filter first — if suction recovers and holds, the battery is not the root cause.

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

This is a BMS overcurrent trip, not a dead battery. Sustained restricted airflow forces the motor to pull current beyond the pack's protection threshold, and the BMS disconnects the output to protect the cells. After a few seconds the BMS resets, power returns, and the cycle repeats. Check the brush roll for hair wrap and the filter for blockage before swapping the battery. If the motor runs cleanly with a clean filter and clear brush roll, verify pack voltage sits above 14.0V on a full charge.