Battery AC DELCO or OEM BMW

Longest battery I had was from AC delco, lasted 10y! But apparently they are different now.

The OEM battery is AGM. If it was an OEM battery it wouldn't be lead acid, at least here in the US. Not sure what you're talking about. I installed mine three years ago and have had no issues despite winters that range from below 0 to summers that reach 100. Fahrenheit obviously.

OEM batteries are made from fairy dust. I still have my original one in my E92, made in 2007. Def recommend getting an OEM battery.

BMW here. No issues.

Tried them all at some point and whatever BMW OE does to those they last 2-3X longer. I literally just replaced a 14 year old battery last September….fuckin insane longevity with the OEM ones.

I'm gonna 2nd the AC Delco recommendation. I have had nothing but issues with Duracell's leaking. I have never had an issue with AC Delco. Its the only battery I buy. The best.

I’ve had my iX for 2.5 years and have logged 122k miles. I haven’t noticed any degradation in battery capacity. Just the normal summer/winter fluctuations (live in Midwest).

I also just had a new battery installed by BMW, $600 for the honor.

Amaron best, 2nd is solite.

Worst was ac delco. Always gave me 1 year max.

Replaced battery in my 2012 Chrysler 200 - after being in car 12 years - yes original battery - bought car off show room floor. Replaced with AC Delco 580 CCA - as per manufactures specs - exactly 2 months to the date - battery absolutely DEAD !!!!!!