Thanks engatwork, I've read that AGM's should be vented and that they don't need to be vented. Supposedly there is an internal valve that could release in an overcharge situation??? There is a tube and 90 degree elbow laying in the battery compartment; but, I don't know if it is original to the car or if it was from a replacement battery.

The replacement battery is an AGM. Do you know if OE was AGM?

The car is very nice and, I'd like to keep it completely original.

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