BMW 325xi recurring dead battery issue despite replacing alternator and battery on BMW 325xi

Some BMW 325xi owners report experiencing recurring dead battery issues even after replacing both the alternator and the battery. These problems may stem from a faulty new alternator that fails to charge the battery adequately. Additionally, poor battery connections, such as loose or dirty terminals, can prevent proper charging and lead to repeated battery failures. Some owners also encounter battery drain caused by electrical components that draw power when the vehicle is off, which can be due to parasitic drains or other electrical system issues. Furthermore, issues with the Intelligent Battery Sensor (IBS) can impact battery performance and contribute to these persistent problems. It is often recommended that owners seek professional inspection from a qualified mechanic to accurately diagnose and address the underlying causes of the dead battery issue.