Robot lawnmower runs for only a short time (e.g., 10–20 minutes) before returning to the base without an error code.

Safety first: Turn OFF the mower before removing the battery.

• Check age of battery: If the battery is older than 2–3 seasons, it may have lost capacity and should be replaced.
• Perform full charge: Leave the mower on the charging station overnight to ensure a complete charge cycle.
• Inspect battery label: Confirm that the installed battery matches the NAC specifications for voltage and capacity.
• Replace battery: If runtime remains short, install a new NAC‑approved battery pack and recycle the old one properly.

Warning: Do not attempt to rebuild or open the battery pack; this is hazardous and voids warranty.