Battery ODYSSEY or OEM BMW
Going with Odyssey MK7.5. The one in my Raptor is awesome 3 years old and tests like it was new. Its not lighter but its a great battery. Try Braille batteries.
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.
I've been using an Odyssey 925 in the Miata with no issues. It gets driven mostly on the weekends and a few times during the week but stays on a B&D 2 amp tender when not driven. I've had this setup for about 6 months so far and it works great for my particular situation with a 3rd car.
The Odyssey PC680 is probably the best battery out there, if you can make it fit. I'd stay away from lithiums, you buy those when you are looking to save weight. For reliable low temperature operation, stick with a lead acid thats had decades of development.
I used straps like the first link when I had an Odyssey battery a few years back. Eventually went back to an OEM one but the straps were an easy solution
I have a half-sized lightweight battery from odyssey. I wouldn't have chosen it, but its never given me any problems and I've been using it for years at this point.
I am still on my original battery in my 2007 335i w/ 87k miles.
So I have the Odyssey 1200MJT in now and securely mounted with their "HDS mounting strap for 1200/1700 series batteries" from West Coast Batteries. It's mounted in the stock location in my 1994 Corrado VR6.
I'd like to say Ive had good luck with the Odyssey but it has maybe seen 100 kms in the 7 years since I put it in so no comment on the quality of the battery.
I ran an Odyssey mini battery in my weekend car, any longer than 2 weeks without driving would drain it. I wouldn't really recommend a mini battery for a daily, if your car doesn't start after 2-3 tries, you might be stuck lol.
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