Robolinho 440629 Replacement Battery 18V 2500mAh Li-ion

Robolinho 100 / 110 Series — 18V Li-ion Replacement Battery (440629)

This 18V 2500mAh Li-ion battery replaces part number 440629 in the Robolinho 100, 110, 41.6, and 1100 robotic lawn mowers. It fits the original battery bay and connects to the same BMS handshake the charger station expects. Voltage and cell count match the factory specification exactly.

• 100 / 110 / 41.6 / 1100 platform compatibility: These models share the same 18V rail, physical connector, and BMS communication protocol — which is why one battery pack covers the full range. The cell configuration and discharge curve are consistent across all listed variants.
• Bench tested on actual hardware: We cycled this pack through blade-motor start surges and sustained cutting loads. The BMS held charge acceptance correctly and the protection circuits triggered at expected thresholds under simulated high-draw conditions.
• Seasonal storage tip: Before first use of the season, bring the battery indoors overnight if temperatures are below 10°C. Cold Li-ion cells have higher internal resistance, and the blade motor inrush current can trip the BMS on a cold pack before a single row is cut.

Charger station showing fault after the mower sat all winter

Li-ion packs self-discharge slowly during storage. If the Robolinho sits in an unheated garage for several months, cell voltage can drop below the charger's acceptance threshold — typically around 2.5V per cell. The docking station reads this as a fault and refuses to begin a charge cycle. To recover the pack, place it in a warm room (above 15°C) for a few hours, then re-dock. If the charger still shows a fault, the cells have discharged too deeply and the pack needs replacing.

Mower cuts out mid-row then restarts on its own

This is thermal protection activating, not a battery fault. When the blade motor works against thick or wet grass, current draw spikes and heat builds in the pack. Once the BMS detects an over-temperature condition, it cuts output to protect the cells. The mower recovers after a 5-minute cooldown. If this happens repeatedly in normal conditions, check that the blade is sharp — a dull blade draws significantly more current on each pass.