Yard Force Amiro 350 18V Replacement Battery GMBE-SP10283

Yard Force Amiro 350 / 400 Series — 18V Li-ion Replacement Battery (GMBE-SP10283)

This 18V 3000mAh (54Wh) Li-ion battery replaces the original pack in the Yard Force Amiro 350, Amiro 350i, Amiro 400, and Amiro 400i robotic lawn mowers. It matches the OEM voltage rail and connector format the mower's BMS expects. Capacity figures are taken directly from the product specification — 3000mAh, no rounding.

• Amiro 350 and 400 series compatibility: These models share the same 18V battery bay, connector pinout, and BMS handshake protocol. One battery covers the full range without modification or adapter.
• Bench tested on actual hardware: We cycled this pack through blade-motor inrush loads that replicate thick-grass conditions. The BMS held without nuisance tripping across repeated high-draw pulses at full 18V discharge.
• Seasonal storage tip: Before the first mow 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's inrush current can trip the BMS on a cold pack before the mower cuts a single row.

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

Robotic mower batteries left uncharged through winter often self-discharge below the charger's acceptance threshold — typically under 12V for an 18V Li-ion pack. The charger's protection circuit sees a cell group in that range and refuses to initiate a charge cycle. Connect the pack to the charger and leave it for 30 minutes without disturbing it; some chargers apply a trickle pre-charge to bring cells back into the acceptance window. If the fault light clears and full charging begins, the pack has recovered. If the fault persists after 45 minutes, the cells have dropped too far and the pack needs replacement.

Mower cuts out mid-row then restarts on its own

This behaviour points to thermal protection, not a faulty battery. When the blade motor works through dense or wet grass, current draw spikes and cell temperature rises quickly. The BMS cuts power to protect the cells, then resets once temperature drops. Allow a five-minute cooldown before restarting the mow cycle. If cutouts happen repeatedly on normal dry grass, check that the blade is sharp — a blunt blade drags more current through the motor and accelerates thermal trips.