I used a supercharger for the 1st time the other day. It said it was going to take 25 minutes so we walked to a Starbucks. While having our coffee I got a message that charging was done and I was getting charged extra for not disconnecting. We walked back and moved the car 5 minutes after the charging completed. There were still empty stalls. I have few questions. Is this a "standard" message? Has anyone gotten charged for taking too long to disconnect their car. And if there is a charge, where does it appear?