One problem related to battery dead has been reported for the 2006 BMW 5 Series. The most recently reported issues are listed below.
The contact owns a 2006 BMW 5 Series. The contact stated that the battery failed twice. The vehicle was taken to the dealer who replaced the battery under warranty. The failure recurred within one month. The contact replaced the battery and did not notify the dealer or the manufacturer. The failure mileage was 40,000 and the current 40,936.