2006 BMW M5, won't start, new battery installed 5 months ago.
2'nd time in a week. Put the key in and the car will light up for about a second and shut down completely. First time it happened I waited it out for about 10 minutes, opened the hood, jiggled the battery cable, slammed the hood and it started right up. Worked fine for 3 days. This time nothing will light back up. Put a charger on the battery, and it kicks the charger off (new charger). Shows that it's charging for about 10 seconds, gets up to 6 on the volt meter, and shuts down. Parking lights flicker as it's doing this. Car has 63,000 miles on it by the way. Don't think it's the alternator as it started the other day and worked again for 3.