Servus, the following situation: Golf 4 (74kw), battery is very weak, car does not start, 2 days later there was no more power. I got a starter, the charging voltage was 14V. Then I drove 60min and turned off the car, 4 days later the battery was completely empty again. This is a few days ago, the battery has now 7.3V, my charger does not recognize the battery and stays in standby mode. Question: If I connect the empty battery back in the car, I can use the Ru measure current to find out if some electricity sucks? Or is it not meaningful due to the low charge and I have to carry it out with a full battery? In addition, since I probably have to buy a new battery anyway, how much cold test current is recommended for Germany or in winter Austria (so at night it gets cold) ?