Parasitic Drain Affects Luxury SUVs

Modern luxury vehicles, including those from Mercedes-Benz, BMW, Audi, Porsche, and Lexus, can experience a parasitic drain on their batteries when parked. This occurs due to the continuous power draw from computers, alarms, and modules, even when the vehicle is turned off. 2 amp-hours per day.

Over time, this can cause the battery to drain, potentially leading to a no-start situation, especially in hot climates. This issue is more likely to affect vehicles that are left parked for extended periods. Hybrids from manufacturers like Lexus, Toyota, and Honda can also experience this issue with their 12-volt auxiliary batteries.

To mitigate this problem, a battery maintainer can be used for vehicles that sit for long stretches. Additionally, if slow cranking or warning lights are observed, it may be necessary to have the battery and electrical system checked for excessive drain or faulty components.