Hi everyone, Just joined the Forum and have bought a E250 AMG Coupe about a year ago and love it. Since working from home due to lockdowns an error issue appeared Auxiliary Battery error. I have been taking the car out on essential runs and after the recent cold weather snap the error appeared. It goes away when the car is started a second time and has now recently appeared once. On reading a fault issue web site it suggested that damage could happen if the car was driven beyond a 100km distance. Spoke to Mercedes Benz who wanted to take it in and run it through a diagnostic test (£100.00 per hour but thought it would take a lot less time than an hour. The replacement battery is £98.11 + time to install it.) I don't want to pay for unnecessary work if this could be down to recent cold weather, but is it German engineering and should be weather proof as Germany has very cold winters. Can anyone think of why the error message is appearing and what I can do to fix it.