1. If a regular serviceable battery is installed, it may be necessary to check and maintain the electrolyte level. Some batteries have MIN and MAX marks on the side and you do not need to unscrew the plugs to check the level. If there are no external marks, unscrew the can plugs and make sure that the electrolyte level is 2...3 mm above the plates. Some batteries have a plastic level indicator under the plugs.
2. Only distilled and deionized water should be added to the battery.
3. Don't forget to screw the caps back on.
Checking the electrolyte level in the battery (12 months) (Audi A4 B5)
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