Car Will Not Start problems of the 2010 Mercedes Benz E350

2010 Mercedes Benz E350. Consumer writes in regards to vehicle electrical problems. The dealer tested the battery and said it was good, but found a problem with the evap blower and installed a new engine fan after two days of analysis. On may 19, 2014, the vehicle failed to start, for a second time, and again the dealer stated there was nothing wrong with the battery, the dealer informed the consumer, the cabin light was left on causing the battery to be drained. On may 20, 2014, the vehicle failed to start right away, so he took the vehicle back to the dealer. He is currently waiting for another analysis.