Ecovacs GOAT G1 18.5V Replacement Battery 5200mAh Li-ion

Ecovacs GOAT G1 Series — 18.5V Li-ion Replacement Battery (201-2201-0903)

This 18.5V Li-ion battery replaces the original pack in the Ecovacs GOAT G1, G1-800, GX-600, and GOAT G1 1600 robotic lawn mowers. Capacity is 5200mAh (96.2Wh), matching the OEM specification. It connects and communicates with the mower's onboard BMS the same way the factory pack does.

• GOAT G1 series platform fit: The G1, G1-800, GX-600, and G1 1600 all share the same 18.5V battery bay, connector pinout, and BMS communication protocol. One replacement pack covers all listed variants without wiring changes or firmware conflicts.
• Bench tested on actual hardware: We cycled this pack through repeated blade-motor start sequences and monitored BMS response under simulated load. Cell balancing completed correctly after the third full charge cycle, and the BMS held cutoff thresholds within spec throughout.
• Cold-weather start preparation: If temperatures are below 10°C, bring the battery indoors overnight before use. Cold Li-ion cells carry higher internal resistance, and the blade motor's inrush current on a cold pack can trip the BMS before the mower clears the dock.

BMS cutoff on thick-grass or wet-grass blade load

The GOAT G1's blade motor draws significantly more current when cutting dense or wet grass than during normal dry-turf operation. If the pack's cells are partially depleted or not yet conditioned, that inrush spike can push instantaneous draw past the BMS overcurrent threshold, triggering a protective shutoff. This is a BMS protection event, not a faulty battery. Running three full charge-discharge cycles first brings cell capacity up and lowers internal resistance enough that the BMS no longer trips on heavy cutting loads.

Charger refusing to accept the pack after winter storage

Li-ion cells left sitting through winter self-discharge slowly, and if the pack drops below roughly 2.5V per cell, the charger's acceptance circuit will not initiate a charge cycle — the dock light may flash amber or show a fault code. This is a low-voltage lockout, not a dead battery. Place the pack on the charger and leave it connected for 30–60 minutes; most Ecovacs chargers include a trickle pre-charge mode that recovers cells from this state. If the charger still shows a fault after that period, check cell voltage with a multimeter — any cell reading below 2.0V indicates the pack has passed recovery threshold.