My 2014 ED smells like that when I run the A/C like it doesn’t drain properly. So I just run with A/C off on vent only before I shut it down or avoid A/C use if possible.
Batteries have 2 vent holes to attach the vent tube and provide a plug for the hole you don't use on the other end of the battery.
The plug is tiny and should be in the plastic bag with the 90degree elbow etc.
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