Stihl · Power Tools
This indicates an internal problem with the battery itself. The battery may need to be replaced, especially if it is out of warranty.
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Check the purchase date of the battery to see if it is still under warranty.
If the battery is faulty, it will need to be replaced with a new compatible battery.
Ensure the battery is being charged with the correct charger and that the charger is functioning properly.
Dispose of the old battery responsibly according to local regulations.