Hello, I wanted to finish the days my Streetka for the season. After the first start, the battery was empty, although it is only 8 months old. After I put a booster on it, the Streetka starts, but after about 5 seconds goes out again and can not start again. The valves blink weakly, the needles of Tacho and dzm twitch. Only when I make the booster again and then again clamp again, the Streetka starts again, but starts n ach 5 seconds back from U.s.w. Does any of you have any idea what that might be? Shutdown switch is pressed, it can’t be. Thanks in advance for the answer. Axel