Battery AC DELCO or OEM BMW

I started buying AC Delco, probably now made in Korea. Anyway, 9 years in my Kia Spectra, 7 years in our rarely driven ‘02 Accord, has another in there from a year or two ago. One that was in my wrecked Cobalt, still works but is sitting. Now one for the Cavalier that had a two year old premium Everstart. The place I get the AC Delco batteries from sells a lot of them so they refresh their inventory. And they are also cheap with my business account. Was $120 for the last one, got the better option they offer. But most have been under $90. Although prices have gone up everywhere throughout various product. Just saying, for whatever reason they have been the only ones I didn’t have to warranty out every 2-3 years. Maybe I’m just getting lucky with them for the last 12-13 years. But I got tired of SuperStart and Everstart batteries that I used to go for. Duracell had been good in customer vehicles.

I took a drive in my i4 a couple of weeks ago that estimated I'd get home with 4% battery. Guess what I rolled into the garage with..... 4% battery. These modern systems are pretty damn accurate.

I just replaced both batteries in my 2018 740iX. Was original battery (build date was Aug 2017) so actually lasted 8 years which was surprising given other problems I had with the car!

My rec would be to find somewhere that sells AC Delco Gold batteries, that's what I use at my shop and they usually have a very good 42mo free replacement warranty and they're great batteries. As long as you don't buy walmarts brand, you're good. I've replaced like 8 Walmart batteries that were less than 6mo old in the last two weeks. No idea wtf those guys are doing.

I still have the original BMW battery on my 2005 e46 325i , I used a battery tester on it and still say it’s good

Everyone likes to shit on BMW for being too complicated when it comes to having to register batteries with the car, but this is the result. Batteries in other cars die way more quickly.

I just changed my 2018 F36’s battery a few months ago. They really do last a long time.

BMW 3 series in the right rear panel. The location is ok, but the box is just enough to slip in a group 49, and there is an air vent hose on the forward side, and a clamp on the rear bottom that is impossible to reach with anything but little elf hands. Then there's also the starter cable, battery management and regular wires running in the same area, all hopelessly in the way..

Dealer measured my 2021 m340xi battery at 700cca last week under load test (vs 850 cca capacity) and said battery needed to be replaced. Terminal was stamped 26th week of 2020.

Worst batteries I've ever had the misfortune to buy. Both died within the space of 3 months and wouldn't put out any power whatsoever. No matter if I tried to charge them, it made no difference.