Battery Deka or OEM BMW

I use Deka for all of my cars and they take Minnesota winters like a champ

Deka is the best I’ve found.

Yes and you can go the route I suggested earlier, with a Group 47 AGM , Deka brand. I paid $135 for mine 4 years ago at Battery Mart. Fit is good, just add a wedge under the battery hold clamp. Cannot leak acid due to the design. I run diesel farm tractors, too. AGM's are the only batteries I can get a decent life from due to the vibration. The extra capacity over the standard lead acid batteries is great for the cold morning diesel start. My point is that they are quite durable. An AGM for a Rabbit is not overkill when you consider the quality problems in regular lead-acid batteries these days.

I've always been a fan of Deka batteries, their ETX15 should be the correct battery.

For about a month I have owned a 2016 REx whose 60 Ah battery is supposed to get 72 miles. This week I fully charged it and have been commuting four four days without topping up. Today the REx kicked in with the trip meter at 73.3 miles. This was a mixture of city traffic jams and short bursts on the carriageway, mostly with the air con on and mostly in Comfort mode. So I'm pretty pleased.

Deka aka East Penn is the best battery manufacturer out there. They dont leak as much, they last typically 3-6 years depending on circumstances

I'm using Deka. But it's a good choice. I haven't any problems with it.

Deka batteries are still good quality. They are somewhat harder to find than other brands.

Ich fahre im Moment nen BMW i3 von 2015 mit nur rund 15 kWh Batteriekapazität und knapp 80k km runter. Da die eh so klein ist und das Auto auch kein großartiges Lademanagement hat, knall ich (und wahrscheinlich alle Vorbesitzer auch) die Batterie eigentlich so gut wie immer auf 100%, was man ja eigentlich vermeiden soll. Das Auto liegt über den Daumen gepeilt ca. 10-15% (eher 10) unter den Angaben, die man so im Netz findet.

I just upgraded mine a few weeks ago, ended up getting a DEKA AGM 9AGM47 More CCA and far more reserve capacity than the stock battery (120 mins) I was at ~35k miles and my OEM battery was failing fast.. I couldn't leave it in the accessory position without the engine running for more than a minute or two or it would barely be able to crank. The OEM battery is crap as far as I'm concerned