One problem related to battery dead has been reported for the 2006 Mini Cooper S. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Mini Cooper S based on all problems reported for the 2006 Cooper S.
Sudden complete loss of power steering. Several days after the original battery failed and was replaced, there was a continuing sound like a fan or electric motor running constantly. This noise continued until the power steering ceased completely during a parking maneuver. After the steering failed the previously noted noise stopped.