Hello dear forum participants, I am currently driving a smart 42 Brabus. the car battery was empty twice without apparent reason and the car didn’t jump any more. at the 2nd time I had the car tested in the workshop on light engine, creep current etc. unfortunately ncihts found. after full charge of the battery he stopped about 2 weeks. now I bought a battery tester (by cigarette lighter) and a charger. question: the battery tester showed me this morning 11.5 volts. at what voltage does the car still jump on? question2: can the car battery of the smart charge over the cigarette lighter without having to tear out the entire footprint? answer very sincerely thanks for evt. best greetings Alexs_be