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Battery maintenance and care
You have to know that lead-acid battery have to periodic preventive maintenance.
Checking the electrolyte level. It must be adjusted to upper level.
Is one chamber darker than the other the cell is demaged and the battery have to be renewed.
You also can check the battery by using a battery syringe. The price is about 3-6 Euro.
You can't check maintenance free battery. If they are defective you have to renewed it.
Another error source are dirty battery contacts as you can see below:
In this case you have to clean it by using a wire brush. After cleaning you have to grease contacts with battery clamp grease (2-3 Euro)