A4 Quattro Wagon V6-2.8L (AHA) (1998)
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Battery: Description and Operation
Batteries With Central Gas Vent
CAUTION!
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Make absolutely certain that only batteries of the most recent design with central gas vents are installed.
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Always use the original cell caps. The caps must be equipped with an O-ring seal.
There are two types of batteries with central gas vents:
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Batteries with a hose on the central gas vent
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Batteries without a hose on the central gas vent