Stiga Autoclip 140 Replacement Battery 25.9V 7800mAh

Stiga Autoclip 140 / 500 Series — 25.9V Li-ion Replacement Battery (1126-9105-01)

This is a 25.9V 7800mAh Li-ion battery for the Stiga Autoclip robotic lawn mower range. It fits the Autoclip 140, 140 4WD, 145, and 500 series, among others. Voltage and capacity match the OEM spec exactly — the mower's charging station and onboard BMS will recognise it without modification.

• Autoclip 140 / 145 / 500 platform fit: These models share the same 25.9V battery bay, connector pinout, and BMS communication protocol. One battery covers the full range listed — no adapters, no wiring changes.
• Bench tested on actual hardware: We ran this pack through full charge and discharge cycles on the Autoclip platform. The BMS handshake cleared on first connection, charge acceptance was confirmed at the station, and cell balancing completed without faults.
• First spring use — temperature prep: If the mower has been stored in a cold garage over winter, bring the battery indoors overnight before reinstalling it. Below 10°C, Li-ion cells carry higher internal resistance and the blade motor's inrush current can trip the BMS on a cold pack before it ever cuts a strip.

BMS cutoff under thick or wet grass blade load

The Autoclip's blade motor draws significantly more current when cutting wet or overgrown grass. If the pack voltage sags quickly under that load, the BMS will cut power to protect the cells — the mower stops, then restarts after a short delay. This is normal protective behaviour, not a battery fault. Running scheduled cuts more frequently keeps grass height low and keeps peak current draw within the BMS threshold.

Charging station showing fault light after winter storage

After months of self-discharge in storage, cell voltage can drop below the charging station's minimum acceptance threshold — typically around 20V for a 25.9V pack. The station reads the low voltage as a fault and refuses to charge. To recover the pack, use a compatible Li-ion charger with a recovery or boost mode to bring each cell above 3.0V, then return the battery to the docking station. If the station then accepts the pack and charges normally, no further action is needed.