Replaced my OE BMW battery today and the numbskulls who did it (it was the 2nd battery in the car from 2012) didn't connect the vent tube! It was just dangling there at the bottom of the battery well. And the EXIDE battery did have a vent port to connect to.
The battery I put in was a Costco Interstate battery. Was the cheapest I could find and a 42 month full replacement warranty. Looked at Autozone/Duralast and EXIDE and OE BMW and all of them were more expensive. Costco's customer service is superb, so decided to save money and if anything goes wrong in 3.5 years, I know Costco will just give me a new one.
2004 330i E46 with ZHP performance package and cold weather package