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post #8 of (permalink) Old 22nd July 2007
Technical Supremo

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It is fairly common to have a vent pipe on a battery especially where it fitted in a tight or enclosed space - its perpose is to allow the hydrogen produced by the battery to be vented into the fresh air. It is not unknown for the gases to ignite and cause a fire or explosion. This applies particularly to batteries used in caravans, etc. Just a few week ago I fitted a new battery to a 1996 Megane which was fitted with a vent pipe because the battery was fixed in a fairly restricted area behind the engine compartment bulkhead. It may also be wise to have the alternator output checked as this can also lead to having a flat battery.
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