A contaminated battery case should be cleaned with cold detergent, water and a brush.
Wash off oxide crystals on the battery terminals with warm soda water or treat with "Neutralon" firms "Warta".
Check if the vents on the plugs are open. Clean them if necessary.
Lubricate the battery terminals and wire terminals with acid-protective grease "Ft40v1" firms "Bosch".
Grease must not get on the contact surfaces.
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