Every year a new problem. My smart is actually a winter car. In spring I made it winter-proof, sprayed all the important parts with corrision spray/oil, sprayed brake discs with so that they don’t bake on the windows again as last year, sprayed wiper sticks, was last year also broken (rust), battery removed and recharged etc. Everything my smart master advised me. Now I have installed the battery, all control lights burn as always, radio works but the engine does not start. Only a sum noise and that was it. Can someone help me to facilitate the troubleshooting. Thank you very much for this.