Ecovacs Winbot W733 Replacement Battery 11.1V 3350mAh

Ecovacs Winbot W733 / TBW60 — 11.1V Li-ion Replacement Battery (10000254)

This is an 11.1V 3350mAh Li-ion battery for the Ecovacs Winbot W733, TBW60, Winbot 733, and W720 window cleaning robots. It replaces OEM part number 10000254. The Winbot mounts to vertical glass and runs entirely on this cell — a degraded battery cuts cleaning cycles short and can cause the robot to lose hold mid-clean.

• W733 / TBW60 / W720 platform fit: These models share the same 11.1V battery bay, connector pinout, and BMS handshake protocol. Swapping across this group works because the charge management circuit expects the same voltage signature from all units in the series.
• Bench tested on actual hardware: We cycled this cell through a full charge and discharge sequence on a W733 unit. The BMS accepted the battery without fault codes, held voltage steady through the cleaning motor and suction pad cycles, and triggered low-voltage cutoff cleanly at the correct threshold.
• Winbot-specific charge practice: Do not leave the Winbot on its charging cradle indefinitely between uses. Unlike floor robots designed for continuous dock contact, the W733 battery degrades faster under prolonged trickle charge. Charge fully, then disconnect until the next clean.

Why the Winbot W733 drops off the glass before the job is done

The W733 uses a suction pad to stay anchored to vertical glass. That pad motor draws from the same battery as the cleaning drive. When cell voltage sags under combined load — suction pad plus drive motor plus cleaning pad — the BMS can trigger an undervoltage cutoff before the indicator shows low. A degraded cell with reduced capacity hits this sag point much earlier in the cycle. Replacing the cell restores the voltage headroom both motors need to run simultaneously without tripping the cutoff.

Replacement battery shows full charge but Winbot stops cleaning after one pass

This is a BMS initialisation issue, not a capacity fault. Some W733 units expect the battery to complete one full discharge-to-cutoff cycle before the BMS calibrates its state-of-charge gauge accurately. If the robot shuts down early on a new cell, run it to full depletion, then charge uninterrupted to 100%. After that conditioning cycle, the BMS reads cell state correctly and the robot completes full window runs. Target a resting voltage of 12.6V after a full charge before retesting.