I could be wrong, but everything on the net says agm non vented and can be fitted in any position, i.e. Upside down even.AndyBeech wrote: ↑Fri Aug 04, 2017 2:53 pmTrue though I do vaguely remember posts in the past when I was looking for a new battery mentioning that the OEM battery was AGM. I could be wrong, but would be nice to be confirmed by someone. If the car had a charging map designed for an AGM battery then I guess it could make some sort of difference.....
AGM for £130 though is good if you can get one now for that. Expect from BMW will be a lot more!
Our alternator isn't smart like stop start cars so no point in spending extra when there is no benefit.