Wow - thank Goodness no one hurt and it doesn't seem to be too much damage. I had one of those bags and then I was paranoid about that because I thought it did not let any air in--- may have to rethink it. I monitor my charger too but do admit to leaving the room briefly. Kind of a good thing you left for a few. I try to leave my charger on concrete -- I have a brick for that purpose rather than metal.