I have an 05 Roadster that has been in storage since last October.About a month ago I realized the battery was completely down,it turns out that the park light switch had been left in the on position.I disconnected the negative terminal and charged the battery back up. Now when I connect the negative terminal bacvk to the attery there is a small spark.If you leave it connected for about 10 minutes,then disconnect and touch it again there is no spark.If you leave it disconnected for any lengh of time ,when you touch it to the battery it sparks again.Anyone have any explanation as to what is happening ???? Thanks