Choosing the right battery for your BMW
For BMW, BMW batteries must be registered to the car with a diagnostic tool. Without registration the alternator continues charging to the old battery's profile and the new one is ruined within months. Most of the current range has a start-stop system, which means AGM or EFB is the floor, not an upgrade — a standard flooded battery in a start-stop car is cycled far beyond what it was built for and typically fails inside a year.

