One problem related to battery has been reported for the 2007 Mini Cooper S. The most recently reported issues are listed below.
As I shut the engine off I noticed smoke coming from under the hood. Opened the hood to find a fire to the front of the engine coming from electrical wires. Was able to put out the fire with out too much damage and disconnected the battery to eliminate power to the troubled area. Car is being towed to Mini cooper of peabody massachusetts.