AL-KO Robolinho 100 18V Replacement Battery 442175 2500mAh

AL-KO Robolinho 100 Series — 18V Li-ion Replacement Battery (442175)

This is an 18V 2500mAh (45Wh) Li-ion replacement battery for the AL-KO Robolinho robotic lawn mower range. It fits the Robolinho 100, 110, 1100, 41.6, and over ten additional Robolinho variants that share the same 18V battery platform. OEM part numbers covered include 442175, 441154, 440454, 442632, 442196, 440629, and 49560610.

• Robolinho 100 series compatibility: These models share the same 18V battery rail, connector format, and BMS handshake protocol. A single replacement cell pack services the full range without modification or adapter.
• Bench tested on actual hardware: We cycled this pack through blade-load simulation including inrush spikes typical of thick-grass cutting. The BMS responded correctly to overcurrent events and recovered without lockout.
• Seasonal start-up tip: Before the first cut of spring, bring the battery indoors overnight if temperatures are below 10°C. Cold Li-ion cells carry higher internal resistance, and the blade motor's inrush current can trip the BMS on a pack that hasn't warmed up.

Charger showing fault after the mower sat in the garage all winter

Li-ion cells self-discharge slowly during storage. If a Robolinho battery sits unused for several months, cell voltage can drop below the charger's acceptance threshold — typically around 12–14V on an 18V pack. The charger sees a pack below its safe entry voltage and refuses to initiate a charge cycle, which shows as a fault or blinking error light. Place the pack on the charger and leave it for 30 minutes; many AL-KO chargers include a recovery mode that trickle-charges a deeply discharged pack back above the acceptance threshold before switching to normal charge. If the charger still shows fault after 30 minutes, check cell voltage with a multimeter — below 10V on the pack indicates a cell that has permanently dropped out.

Mower cuts out mid-row then restarts on its own after a short pause

This is thermal protection activating inside the BMS, not a cell failure. Thick or wet grass forces the blade motor to draw sustained high current, which heats the BMS protection circuit. Once internal temperature hits the cutoff threshold, the BMS opens the discharge path and the mower stops. The pack recovers once it cools — typically within five minutes. If this happens repeatedly on the same lawn section, check that the cutting height is not set too low for current grass length, as a single-pass height reduction reduces blade load and prevents repeated thermal trips.