Hi I have just joined and have a similar problem with our 2008 300c estate. Battery drained twice within two weeks, replaced it and the new one darined within the week. No indication of slugish starting. In the garage now and they are unable to locate the problem but have confirmed that there is a drain on the battery. This occured last thursday morning, the car alarm went off for no reason, swiched it off then went to start the car to find that the battery was flat. Recharged the battery and drove to the garage for them to resolve the problem. It's still there. Any advice would be most grateful. Regards Dave
