Robot lawnmower shows E8 and returns to the station or stops; often after long operation.

Safety first: Turn OFF the mower and unplug the charging station before opening any covers.

• Check runtime: If the mower's mowing time has significantly decreased compared to when new, the battery is likely worn out.
• Inspect charging contacts: Clean the charging contacts on both the mower and the station with a dry cloth. Remove oxidation with a fine abrasive pad if necessary.
• Check battery connection: Open the battery compartment according to the Einhell instructions. Ensure the battery plug is fully seated and there are no signs of heat damage or corrosion.
• Charge fully: Place the mower in the station and allow it to charge uninterrupted for the full recommended time. Then start a mowing cycle and observe how long it runs before E8 appears.
• Replace battery if needed: If E8 appears quickly despite a full charge, replace the battery with an original Einhell robot mower battery pack of the correct voltage and capacity.