Ambrogio Alex 25.2V Replacement Battery AG6208003 3400mAh

Ambrogio Alex / L30 / L50 Series — 25.2V Li-ion Replacement Battery (AG6208003)

This is a 25.2V 3400mAh Li-ion replacement battery for the Ambrogio Alex, L30, L30 Elite, L50, and compatible robotic lawn mower models. It matches the OEM part number AG6208003 and slots into the same bay as the original pack. Voltage and capacity are matched to the mower's autonomous drive and blade motor system.

• Alex, L30, and L50 platform compatibility: These models share the same 25.2V battery architecture, connector format, and BMS handshake protocol. A single cell configuration covers the full range without modification.
• Bench tested on actual hardware: We cycled this pack through blade motor start loads and drive system draws. The BMS held cutoff thresholds correctly at both peak inrush and sustained mowing current without false trips.
• Seasonal storage tip: Before the first spring mow, bring the battery indoors overnight if temperatures have been below 10°C. Cold Li-ion cells carry higher internal resistance, and the blade motor's inrush current on a cold pack can trip the BMS at startup — even if the battery reads a healthy charge level.

Charger showing fault after the mower sat unused all winter

Robotic mowers often go months without use between autumn and spring. Over that period, a Li-ion pack in storage will self-discharge. If it drops below roughly 2.5V per cell, the charger's acceptance circuit sees the pack as faulty and refuses to begin a charge cycle. This is a BMS protection response, not charger failure. Some Ambrogio chargers have a recovery or wake mode — consult your charger manual for the activation step. If the pack has held above 2.5V per cell, a successful charge cycle will begin normally within a few minutes of connection.

Mower cutting out mid-row in thick or wet grass then restarting itself

Heavy blade load — thick growth or wet conditions — draws higher current than the mower sees on a normal dry lawn. When that current spikes past the BMS threshold, the pack shuts output to protect the cells. The mower stops, the BMS resets after a short pause, and the unit restarts. This is not a faulty battery. Let the mower sit for five minutes before resuming, and check that the blade is clean and sharp — a dull or clogged blade pulls significantly more current per cut.