Apologies if this is in the wrong sub forum.
I've just swapped out my original BMW battery on my 2008 E92 for an after market Exide Excell and came across the white vent pipe in the process.
It appears as though the pipe was never connected to the original BMW battery in the first place (either that, or I managed to knock it out whilst removing the battery without noticing). I also had a quick look at the BMW battery after removing it and couldn't find a port for it to connect to anyway (but it was late in the evening, and dark, so I may have missed it).
Consequently I'm wondering if these sorts of batteries (non-AGM) always come with vent ports, and if they always need to be connected? The Exide appears to have some black plugs covering some sockets on either end of the battery of roughly the right size to accommodate the vent pipe, but I couldn't for the life of me get the plugs out of the sockets to see if they fit - as a result, I left them in place.
Does anyone have any advice here as to what the correct installation procedure is? It's the first time I've come across any sort of vent pipe/port on a battery in any of the cars I've owned - but then again, it's the first time I've ever done it in a BMW. I don't really want to be driving around with a ticking time bomb in the boot if these are supposed to vent in some way!