Woke up to a dead Mercedes-Benz E-Class W213? Learn what usually causes a parasitic battery drain overnight, what to check first, and whether you can still drive safely.
If your W213 battery is flat after a night in the driveway, the first thing I'd suspect is a parasitic electrical draw — something staying awake when the car should be off. It's not your imagination: modern E-Class cars have dozens of electronic modules, and any one of them can keep the network alive, slowly pulling power all night. The good news is that, in most cases, you don't have to replace an expensive controller.
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