Stiga Autoclip 125 Replacement Battery 25.2V 3400mAh

Stiga Autoclip 125 / 200 Series — 25.2V Li-ion Replacement Battery (1126-1032-01)

This 25.2V 3400mAh Li-ion battery replaces the original pack in the Stiga Autoclip 125, 127, 200, and 223 robotic lawn mowers, along with nine additional Autoclip models. It matches the original voltage rail and connector, so it slots into the existing bay without modification. Capacity is 3400mAh (85.68Wh), identical to the factory specification.

• Autoclip series compatibility: The Autoclip 125 through 223 range shares a common 25.2V battery platform, the same physical housing, connector pinout, and BMS communication protocol. One replacement covers the full lineup without adapters or firmware workarounds.
• Bench tested on actual hardware: We cycled this pack through blade-motor inrush loads and navigation draws. The BMS held cutoff thresholds within spec across repeated high-draw events and returned to standby cleanly after each load spike.
• Seasonal storage tip: If the mower has been docked and unused through winter, check the pack voltage before placing it on charge — a cell that has self-discharged below roughly 2.5V per cell may cause the charger to show a fault. Bring the mower indoors for two hours first, then attempt charging.

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

Li-ion cells self-discharge slowly over months. A pack left in a cold garage from October to March can drop below the charger's minimum acceptance voltage — typically around 15V for a 25.2V pack. The Stiga charger reads the pack voltage on connection and refuses to charge if it falls below that threshold, showing a red fault light instead of the green charge cycle. Bring the mower and battery indoors to 18–20°C for two to four hours, then reconnect to the charger. This allows the cells to recover enough voltage for the charger to accept the pack and begin a normal cycle.

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

This is thermal protection activating, not a battery fault. When the blade motor works through thick or wet grass, current draw spikes and heat builds in the pack faster than the BMS expects under normal lawn conditions. Once internal temperature crosses the BMS cutoff threshold, the pack shuts output and waits for the cells to cool. The mower restarts automatically once temperature drops back into range — this typically takes three to five minutes on a flat surface in open air. If it happens repeatedly in a single session, reduce the mowing zone or schedule shorter overlapping runs rather than one long pass through dense growth.