Hello together, a problem solved, so the next thing starts immediately: Wednesday morning wanted to drive my everyday car (Volvo V40 with start-stop and EFB battery) to work, then a Christmas tree greeted me at all possible error messages, engine was not possible. Then I left the car and borrowed my mother’s car because it didn’t need it that day. When I came back to my car in the evening, it was completely dead, there was no light left. So my CT After 15 hours it was still only with 4 LEDs, so ready to start but not fully charged, but the voltage was at least 12.5-12.6 V (the scale of my multimeter is unfortunately somewhat imprecise). Nevertheless, still nothing happened, no light went on, engine start was not possible. I then gave a starter with another car and at once life returned. Then I drove directly a lap and since then a But my trust is gone, unfortunately I have often stopped with defective battery, in the morning still without problems to work, in the evening battery dead. I then had the battery tested in a workshop today, it brings only 75% cold test current, one advised me to replace it. At the same time the battery is not yet 3.5 years old. What do you think, replace or is there still life in it? Greetings Olli